202131310021123 has 4 divisors (see below), whose sum is σ = 231007211452720. Its totient is φ = 173255408589528.

The previous prime is 202131310021099. The next prime is 202131310021133. The reversal of 202131310021123 is 321120013131202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202131310021123 is a prime.

It is a super-2 number, since 2×202131310021123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202131310021094 and 202131310021103.

It is not an unprimeable number, because it can be changed into a prime (202131310021133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14437950715788 + ... + 14437950715801.

It is an arithmetic number, because the mean of its divisors is an integer number (57751802863180).

Almost surely, 2^{202131310021123} is an apocalyptic number.

202131310021123 is a deficient number, since it is larger than the sum of its proper divisors (28875901431597).

202131310021123 is an equidigital number, since it uses as much as digits as its factorization.

202131310021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28875901431596.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 202131310021123 its reverse (321120013131202), we get a palindrome (523251323152325).

The spelling of 202131310021123 in words is "two hundred two trillion, one hundred thirty-one billion, three hundred ten million, twenty-one thousand, one hundred twenty-three".