21612640122 has 24 divisors (see below), whose sum is σ = 47486930400. Its totient is φ = 7102745160.

The previous prime is 21612640111. The next prime is 21612640123. The reversal of 21612640122 is 22104621612.

21612640122 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 2 + 640 + 12 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21612640123) 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, 8454372 + ... + 8456927.

It is an arithmetic number, because the mean of its divisors is an integer number (1978622100).

Almost surely, 2^21612640122 is an apocalyptic number.

21612640122 is an abundant number, since it is smaller than the sum of its proper divisors (25874290278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612640122 is a wasteful number, since it uses less digits than its factorization.

21612640122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16911378 (or 16911375 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 21612640122 in words is "twenty-one billion, six hundred twelve million, six hundred forty thousand, one hundred twenty-two".