21646152556212 has 48 divisors (see below), whose sum is σ = 50630419445760. Its totient is φ = 7197852798048.

The previous prime is 21646152556183. The next prime is 21646152556243. The reversal of 21646152556212 is 21265525164612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136194463 + ... + 136353305.

It is an arithmetic number, because the mean of its divisors is an integer number (1054800405120).

Almost surely, 2^{21646152556212} is an apocalyptic number.

It is an amenable number.

21646152556212 is an abundant number, since it is smaller than the sum of its proper divisors (28984266889548).

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

21646152556212 is a wasteful number, since it uses less digits than its factorization.

21646152556212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186372 (or 186370 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The spelling of 21646152556212 in words is "twenty-one trillion, six hundred forty-six billion, one hundred fifty-two million, five hundred fifty-six thousand, two hundred twelve".