21210974976618 has 24 divisors (see below), whose sum is σ = 52522414228128. Its totient is φ = 6060278564712.

The previous prime is 21210974976517. The next prime is 21210974976671. The reversal of 21210974976618 is 81667947901212.

21210974976618 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 0 + 9 + 7 + 4 + 9 + 7 + 6 + 618 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84170535496 + ... + 84170535747.

It is an arithmetic number, because the mean of its divisors is an integer number (2188433926172).

Almost surely, 2^{21210974976618} is an apocalyptic number.

21210974976618 is an abundant number, since it is smaller than the sum of its proper divisors (31311439251510).

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

21210974976618 is a wasteful number, since it uses less digits than its factorization.

21210974976618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168341071258 (or 168341071255 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 63.

The spelling of 21210974976618 in words is "twenty-one trillion, two hundred ten billion, nine hundred seventy-four million, nine hundred seventy-six thousand, six hundred eighteen".