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121220010021 = 31119918458963
BaseRepresentation
bin111000011100101000…
…1101001000000100101
3102120220000211112121210
41300321101221000211
53441224310310041
6131404313302033
711520642040635
oct1607121510045
9376800745553
10121220010021
1147455598770
121b5b0404919
13b57ab966a6
145c1d3a46c5
153247145016
hex1c39469025

121220010021 has 16 divisors (see below), whose sum is σ = 177206054400. Its totient is φ = 73097489520.

The previous prime is 121220010011. The next prime is 121220010031. The reversal of 121220010021 is 120010022121.

It is an interprime number because it is at equal distance from previous prime (121220010011) and next prime (121220010031).

It is not a de Polignac number, because 121220010021 - 223 = 121211621413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220009979 and 121220010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220010011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9222915 + ... + 9236048.

It is an arithmetic number, because the mean of its divisors is an integer number (11075378400).

Almost surely, 2121220010021 is an apocalyptic number.

121220010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220010021 is a deficient number, since it is larger than the sum of its proper divisors (55986044379).

121220010021 is a wasteful number, since it uses less digits than its factorization.

121220010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18459176.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121220010021 its reverse (120010022121), we get a palindrome (241230032142).

It can be divided in two parts, 1212200 and 10021, that added together give a palindrome (1222221).

The spelling of 121220010021 in words is "one hundred twenty-one billion, two hundred twenty million, ten thousand, twenty-one".

Divisors: 1 3 11 33 199 597 2189 6567 18458963 55376889 203048593 609145779 3673333637 11020000911 40406670007 121220010021