21056022138996 has 72 divisors (see below), whose sum is σ = 60690887364744. Its totient is φ = 6097671567360.

The previous prime is 21056022138973. The next prime is 21056022138997. The reversal of 21056022138996 is 69983122065012.

21056022138996 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 602 + 21 + 3 + 8 + 9 + 9 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7216282906596 + 13839739232400 = 2686314^2 + 3720180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056022138997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1323271465 + ... + 1323287376.

It is an arithmetic number, because the mean of its divisors is an integer number (842928991177).

Almost surely, 2^{21056022138996} is an apocalyptic number.

21056022138996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21056022138996 is an abundant number, since it is smaller than the sum of its proper divisors (39634865225748).

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

21056022138996 is a wasteful number, since it uses less digits than its factorization.

21056022138996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646558881 (or 2646558876 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 21056022138996 in words is "twenty-one trillion, fifty-six billion, twenty-two million, one hundred thirty-eight thousand, nine hundred ninety-six".