131231331220021 has 8 divisors (see below), whose sum is σ = 131338774523264. Its totient is φ = 131123889279360.

The previous prime is 131231331220013. The next prime is 131231331220027. The reversal of 131231331220021 is 120022133132131.

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 131231331220021 - 2³ = 131231331220013 is a prime.

It is a super-2 number, since 2×131231331220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231331220027) 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, 301479685 + ... + 301914661.

It is an arithmetic number, because the mean of its divisors is an integer number (16417346815408).

Almost surely, 2^{131231331220021} is an apocalyptic number.

It is an amenable number.

131231331220021 is a deficient number, since it is larger than the sum of its proper divisors (107443303243).

131231331220021 is a wasteful number, since it uses less digits than its factorization.

131231331220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681291.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 131231331220021 its reverse (120022133132131), we get a palindrome (251253464352152).

The spelling of 131231331220021 in words is "one hundred thirty-one trillion, two hundred thirty-one billion, three hundred thirty-one million, two hundred twenty thousand, twenty-one".