21356211550604 has 12 divisors (see below), whose sum is σ = 42712423101264. Its totient is φ = 9152662093104.

The previous prime is 21356211550561. The next prime is 21356211550631. The reversal of 21356211550604 is 40605511265312.

21356211550604 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381360920519 + ... + 381360920574.

It is an arithmetic number, because the mean of its divisors is an integer number (3559368591772).

Almost surely, 2^{21356211550604} is an apocalyptic number.

It is an amenable number.

21356211550604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21356211550604 is a wasteful number, since it uses less digits than its factorization.

21356211550604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762721841104 (or 762721841102 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21356211550604 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred eleven million, five hundred fifty thousand, six hundred four".