12215705121 has 32 divisors (see below), whose sum is σ = 18408861440. Its totient is φ = 8003836800.

The previous prime is 12215705087. The next prime is 12215705167. The reversal of 12215705121 is 12150751221.

12215705121 is a `hidden beast` number, since 1 + 2 + 21 + 570 + 51 + 21 = 666.

It is not a de Polignac number, because 12215705121 - 2¹³ = 12215696929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12215705221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2885076 + ... + 2889306.

It is an arithmetic number, because the mean of its divisors is an integer number (575276920).

Almost surely, 2^12215705121 is an apocalyptic number.

It is an amenable number.

12215705121 is a deficient number, since it is larger than the sum of its proper divisors (6193156319).

12215705121 is a wasteful number, since it uses less digits than its factorization.

12215705121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6054 (or 6048 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The spelling of 12215705121 in words is "twelve billion, two hundred fifteen million, seven hundred five thousand, one hundred twenty-one".