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121112010221 = 162177468213
BaseRepresentation
bin111000011001011010…
…1101001110111101101
3102120121111121120202012
41300302311221313231
53441014133311341
6131345454411005
711515161046466
oct1606265516755
9376544546665
10121112010221
11473aa632934
121b580200a65
13b5616b1897
145c0cccdd6d
15323c9100eb
hex1c32d69ded

121112010221 has 4 divisors (see below), whose sum is σ = 121119494652. Its totient is φ = 121104525792.

The previous prime is 121112010197. The next prime is 121112010223. The reversal of 121112010221 is 122010211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110879676196 + 10232334025 = 332986^2 + 101155^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112010221 - 214 = 121111993837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112010196 and 121112010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112010223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3717890 + ... + 3750323.

It is an arithmetic number, because the mean of its divisors is an integer number (30279873663).

Almost surely, 2121112010221 is an apocalyptic number.

It is an amenable number.

121112010221 is a deficient number, since it is larger than the sum of its proper divisors (7484431).

121112010221 is an equidigital number, since it uses as much as digits as its factorization.

121112010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7484430.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121112010221 its reverse (122010211121), we get a palindrome (243122221342).

Subtracting 121112010221 from its reverse (122010211121), we obtain a square (898200900 = 299702).

The spelling of 121112010221 in words is "one hundred twenty-one billion, one hundred twelve million, ten thousand, two hundred twenty-one".

Divisors: 1 16217 7468213 121112010221