21131255305104 has 80 divisors (see below), whose sum is σ = 62405390085120. Its totient is φ = 6035771733120.

The previous prime is 21131255305087. The next prime is 21131255305123. The reversal of 21131255305104 is 40150355213112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7834564 + ... + 10180515.

It is an arithmetic number, because the mean of its divisors is an integer number (780067376064).

Almost surely, 2^{21131255305104} is an apocalyptic number.

21131255305104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21131255305104 is an abundant number, since it is smaller than the sum of its proper divisors (41274134780016).

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

21131255305104 is a wasteful number, since it uses less digits than its factorization.

21131255305104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18018588 (or 18018582 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 21131255305104 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred fifty-five million, three hundred five thousand, one hundred four".