131331312021 has 32 divisors (see below), whose sum is σ = 215547313408. Its totient is φ = 69264253440.

The previous prime is 131331312017. The next prime is 131331312197. The reversal of 131331312021 is 120213133131.

It is a happy number.

It is not a de Polignac number, because 131331312021 - 2² = 131331312017 is a prime.

It is a super-3 number, since 3×131331312021³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131331312001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2281425 + ... + 2338281.

It is an arithmetic number, because the mean of its divisors is an integer number (6735853544).

Almost surely, 2^131331312021 is an apocalyptic number.

It is an amenable number.

131331312021 is a deficient number, since it is larger than the sum of its proper divisors (84216001387).

131331312021 is a wasteful number, since it uses less digits than its factorization.

131331312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65341.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 131331312021 its reverse (120213133131), we get a palindrome (251544445152).

The spelling of 131331312021 in words is "one hundred thirty-one billion, three hundred thirty-one million, three hundred twelve thousand, twenty-one".