31042301021 has 2 divisors, whose sum is σ = 31042301022. Its totient is φ = 31042301020.

The previous prime is 31042300987. The next prime is 31042301027. The reversal of 31042301021 is 12010324013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22071559225 + 8970741796 = 148565^2 + 94714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31042301021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31042301027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15521150510 + 15521150511.

It is an arithmetic number, because the mean of its divisors is an integer number (15521150511).

Almost surely, 2^31042301021 is an apocalyptic number.

It is an amenable number.

31042301021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31042301021 is an equidigital number, since it uses as much as digits as its factorization.

31042301021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31042301021 its reverse (12010324013), we get a palindrome (43052625034).

The spelling of 31042301021 in words is "thirty-one billion, forty-two million, three hundred one thousand, twenty-one".