231021200031 has 16 divisors (see below), whose sum is σ = 309559256160. Its totient is φ = 153249684480.

The previous prime is 231021199987. The next prime is 231021200077. The reversal of 231021200031 is 130002120132.

It is not a de Polignac number, because 231021200031 - 2¹¹ = 231021197983 is a prime.

It is a super-2 number, since 2×231021200031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231021200731) 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, 758571 + ... + 1018563.

It is an arithmetic number, because the mean of its divisors is an integer number (19347453510).

Almost surely, 2^231021200031 is an apocalyptic number.

231021200031 is a deficient number, since it is larger than the sum of its proper divisors (78538056129).

231021200031 is a wasteful number, since it uses less digits than its factorization.

231021200031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261466.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 231021200031 its reverse (130002120132), we get a palindrome (361023320163).

The spelling of 231021200031 in words is "two hundred thirty-one billion, twenty-one million, two hundred thousand, thirty-one".