131312021 has 8 divisors (see below), whose sum is σ = 138434400. Its totient is φ = 124210800.

The previous prime is 131312011. The next prime is 131312033. The reversal of 131312021 is 120213131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131312021 - 2²⁶ = 64203157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131311987 and 131312005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131312011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8390 + ... + 18248.

It is an arithmetic number, because the mean of its divisors is an integer number (17304300).

Almost surely, 2^131312021 is an apocalyptic number.

It is an amenable number.

131312021 is a deficient number, since it is larger than the sum of its proper divisors (7122379).

131312021 is an equidigital number, since it uses as much as digits as its factorization.

131312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10579.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 131312021 is about 11459.1457360486. The cubic root of 131312021 is about 508.2782139525.

Adding to 131312021 its reverse (120213131), we get a palindrome (251525152).

The spelling of 131312021 in words is "one hundred thirty-one million, three hundred twelve thousand, twenty-one".