21738557067204 has 24 divisors (see below), whose sum is σ = 53707023343008. Its totient is φ = 6819939472000.

The previous prime is 21738557067133. The next prime is 21738557067211. The reversal of 21738557067204 is 40276075583712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53280776922 + ... + 53280777329.

It is an arithmetic number, because the mean of its divisors is an integer number (2237792639292).

Almost surely, 2^{21738557067204} is an apocalyptic number.

It is an amenable number.

21738557067204 is an abundant number, since it is smaller than the sum of its proper divisors (31968466275804).

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

21738557067204 is a wasteful number, since it uses less digits than its factorization.

21738557067204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106561554275 (or 106561554273 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 57.

The spelling of 21738557067204 in words is "twenty-one trillion, seven hundred thirty-eight billion, five hundred fifty-seven million, sixty-seven thousand, two hundred four".