210131231021 has 2 divisors, whose sum is σ = 210131231022. Its totient is φ = 210131231020.

The previous prime is 210131231003. The next prime is 210131231039. The reversal of 210131231021 is 120132131012.

It is a balanced prime because it is at equal distance from previous prime (210131231003) and next prime (210131231039).

It can be written as a sum of positive squares in only one way, i.e., 201484276900 + 8646954121 = 448870^2 + 92989^2 .

It is a cyclic number.

It is not a de Polignac number, because 210131231021 - 2²⁶ = 210064122157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210131531021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105065615510 + 105065615511.

It is an arithmetic number, because the mean of its divisors is an integer number (105065615511).

Almost surely, 2^210131231021 is an apocalyptic number.

It is an amenable number.

210131231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210131231021 is an equidigital number, since it uses as much as digits as its factorization.

210131231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 210131231021 its reverse (120132131012), we get a palindrome (330263362033).

The spelling of 210131231021 in words is "two hundred ten billion, one hundred thirty-one million, two hundred thirty-one thousand, twenty-one".