21073008637668 has 96 divisors (see below), whose sum is σ = 55804267008000. Its totient is φ = 6135620724864.

The previous prime is 21073008637607. The next prime is 21073008637669. The reversal of 21073008637668 is 86673680037012.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (21073008637669) 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, 1561218 + ... + 6677081.

It is an arithmetic number, because the mean of its divisors is an integer number (581294448000).

Almost surely, 2^{21073008637668} is an apocalyptic number.

It is an amenable number.

21073008637668 is an abundant number, since it is smaller than the sum of its proper divisors (34731258370332).

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

21073008637668 is a wasteful number, since it uses less digits than its factorization.

21073008637668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8239201 (or 8239199 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 21073008637668 in words is "twenty-one trillion, seventy-three billion, eight million, six hundred thirty-seven thousand, six hundred sixty-eight".