202131312123 has 54 divisors (see below), whose sum is σ = 299741564052. Its totient is φ = 121105445760.

The previous prime is 202131312121. The next prime is 202131312139. The reversal of 202131312123 is 321213131202.

It is not a de Polignac number, because 202131312123 - 2¹ = 202131312121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202131312123.

It is not an unprimeable number, because it can be changed into a prime (202131312121) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 415053786 + ... + 415054272.

Almost surely, 2^202131312123 is an apocalyptic number.

202131312123 is a deficient number, since it is larger than the sum of its proper divisors (97610251929).

202131312123 is an frugal number, since it uses more digits than its factorization.

202131312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Multiplying 202131312123 by its product of nonzero digits (432), we get a square (87320726837136 = 9344556²).

Adding to 202131312123 its reverse (321213131202), we get a palindrome (523344443325).

The spelling of 202131312123 in words is "two hundred two billion, one hundred thirty-one million, three hundred twelve thousand, one hundred twenty-three".