21531532501413 has 64 divisors (see below), whose sum is σ = 36092787344640. Its totient is φ = 12571015968000.

The previous prime is 21531532501321. The next prime is 21531532501439. The reversal of 21531532501413 is 31410523513512.

It is a happy number.

21531532501413 is a `hidden beast` number, since 2 + 1 + 5 + 31 + 532 + 50 + 1 + 41 + 3 = 666.

It is not a de Polignac number, because 21531532501413 - 2¹² = 21531532497317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531532571413) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8589970 + ... + 10809747.

It is an arithmetic number, because the mean of its divisors is an integer number (563949802260).

Almost surely, 2^{21531532501413} is an apocalyptic number.

It is an amenable number.

21531532501413 is a deficient number, since it is larger than the sum of its proper divisors (14561254843227).

21531532501413 is a wasteful number, since it uses less digits than its factorization.

21531532501413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19399875 (or 19399869 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 21531532501413 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-two million, five hundred one thousand, four hundred thirteen".