21265066217772 has 108 divisors (see below), whose sum is σ = 58209934681080. Its totient is φ = 6542689061376.

The previous prime is 21265066217749. The next prime is 21265066217803. The reversal of 21265066217772 is 27771266056212.

21265066217772 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 5 + 0 + 6 + 621 + 7 + 7 + 7 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 105876868 + ... + 106077524.

Almost surely, 2^{21265066217772} is an apocalyptic number.

It is an amenable number.

21265066217772 is an abundant number, since it is smaller than the sum of its proper divisors (36944868463308).

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

21265066217772 is a wasteful number, since it uses less digits than its factorization.

21265066217772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218112 (or 218094 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 21265066217772 in words is "twenty-one trillion, two hundred sixty-five billion, sixty-six million, two hundred seventeen thousand, seven hundred seventy-two".