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21020012111 = 721099339023
BaseRepresentation
bin10011100100111000…
…111110111001001111
32000020220212020211002
4103210320332321033
5321022110341421
613353443450515
71342616104100
oct234470767117
960226766732
1021020012111
118a0728123a
1240a7686a3b
131c9cb008b7
1410359623a7
158305a1b0b
hex4e4e3ee4f

21020012111 has 12 divisors (see below), whose sum is σ = 24454701792. Its totient is φ = 18015052608.

The previous prime is 21020012099. The next prime is 21020012129. The reversal of 21020012111 is 11121002012.

It is not a de Polignac number, because 21020012111 - 234 = 3840142927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020012092 and 21020012101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020012161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519146 + ... + 558168.

It is an arithmetic number, because the mean of its divisors is an integer number (2037891816).

Almost surely, 221020012111 is an apocalyptic number.

21020012111 is a deficient number, since it is larger than the sum of its proper divisors (3434689681).

21020012111 is a wasteful number, since it uses less digits than its factorization.

21020012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50030 (or 50023 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21020012111 its reverse (11121002012), we get a palindrome (32141014123).

The spelling of 21020012111 in words is "twenty-one billion, twenty million, twelve thousand, one hundred eleven".

Divisors: 1 7 49 10993 39023 76951 273161 538657 1912127 428979839 3002858873 21020012111