21551776160012 has 12 divisors (see below), whose sum is σ = 43103552320080. Its totient is φ = 9236475497136.

The previous prime is 21551776159973. The next prime is 21551776160107. The reversal of 21551776160012 is 21006167715512.

21551776160012 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, 384853145687 + ... + 384853145742.

It is an arithmetic number, because the mean of its divisors is an integer number (3591962693340).

Almost surely, 2^{21551776160012} is an apocalyptic number.

It is an amenable number.

21551776160012 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.

21551776160012 is a wasteful number, since it uses less digits than its factorization.

21551776160012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769706291440 (or 769706291438 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 21551776160012 in words is "twenty-one trillion, five hundred fifty-one billion, seven hundred seventy-six million, one hundred sixty thousand, twelve".