13131512512021 has 4 divisors (see below), whose sum is σ = 13316463392544. Its totient is φ = 12946561631500.

The previous prime is 13131512512003. The next prime is 13131512512039. The reversal of 13131512512021 is 12021521513131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (13131512512003) and next prime (13131512512039).

It is a cyclic number.

It is not a de Polignac number, because 13131512512021 - 2¹³ = 13131512503829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131512512081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92475440155 + ... + 92475440296.

It is an arithmetic number, because the mean of its divisors is an integer number (3329115848136).

Almost surely, 2^{13131512512021} is an apocalyptic number.

It is an amenable number.

13131512512021 is a deficient number, since it is larger than the sum of its proper divisors (184950880523).

13131512512021 is an equidigital number, since it uses as much as digits as its factorization.

13131512512021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184950880522.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 13131512512021 in words is "thirteen trillion, one hundred thirty-one billion, five hundred twelve million, five hundred twelve thousand, twenty-one".