231310022021 has 16 divisors (see below), whose sum is σ = 249508874160. Its totient is φ = 213169397760.

The previous prime is 231310021967. The next prime is 231310022023. The reversal of 231310022021 is 120220013132.

It can be written as a sum of positive squares in 8 ways, for example, as 28530925921 + 202779096100 = 168911^2 + 450310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231310022021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231310022023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32442785 + ... + 32449913.

It is an arithmetic number, because the mean of its divisors is an integer number (15594304635).

Almost surely, 2^231310022021 is an apocalyptic number.

It is an amenable number.

231310022021 is a deficient number, since it is larger than the sum of its proper divisors (18198852139).

231310022021 is a wasteful number, since it uses less digits than its factorization.

231310022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10856.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 231310022021 its reverse (120220013132), we get a palindrome (351530035153).

The spelling of 231310022021 in words is "two hundred thirty-one billion, three hundred ten million, twenty-two thousand, twenty-one".