210020431931 has 2 divisors, whose sum is σ = 210020431932. Its totient is φ = 210020431930.

The previous prime is 210020431847. The next prime is 210020431991. The reversal of 210020431931 is 139134020012.

210020431931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210020431931 - 2¹⁸ = 210020169787 is a prime.

It is a super-2 number, since 2×210020431931² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210020431931.

It is not a weakly prime, because it can be changed into another prime (210020431991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010215965 + 105010215966.

It is an arithmetic number, because the mean of its divisors is an integer number (105010215966).

Almost surely, 2^210020431931 is an apocalyptic number.

210020431931 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020431931 is an equidigital number, since it uses as much as digits as its factorization.

210020431931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 210020431931 its reverse (139134020012), we get a palindrome (349154451943).

The spelling of 210020431931 in words is "two hundred ten billion, twenty million, four hundred thirty-one thousand, nine hundred thirty-one".