21653256312060 has 48 divisors (see below), whose sum is σ = 60765978059136. Its totient is φ = 5761167360832.

The previous prime is 21653256312031. The next prime is 21653256312073. The reversal of 21653256312060 is 6021365235612.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 407295774 + ... + 407348933.

It is an arithmetic number, because the mean of its divisors is an integer number (1265957876232).

Almost surely, 2^{21653256312060} is an apocalyptic number.

21653256312060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21653256312060 is an abundant number, since it is smaller than the sum of its proper divisors (39112721747076).

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

21653256312060 is a wasteful number, since it uses less digits than its factorization.

21653256312060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814645162 (or 814645160 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 21653256312060 in words is "twenty-one trillion, six hundred fifty-three billion, two hundred fifty-six million, three hundred twelve thousand, sixty".