31040153021 has 2 divisors, whose sum is σ = 31040153022. Its totient is φ = 31040153020.

The previous prime is 31040153003. The next prime is 31040153041. The reversal of 31040153021 is 12035104013.

It is an a-pointer prime, because the next prime (31040153041) can be obtained adding 31040153021 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26637830521 + 4402322500 = 163211^2 + 66350^2 .

It is a cyclic number.

It is not a de Polignac number, because 31040153021 - 2¹⁸ = 31039890877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31040152984 and 31040153002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31040153041) 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, 15520076510 + 15520076511.

It is an arithmetic number, because the mean of its divisors is an integer number (15520076511).

Almost surely, 2^31040153021 is an apocalyptic number.

It is an amenable number.

31040153021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31040153021 is an equidigital number, since it uses as much as digits as its factorization.

31040153021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 31040153021 its reverse (12035104013), we get a palindrome (43075257034).

The spelling of 31040153021 in words is "thirty-one billion, forty million, one hundred fifty-three thousand, twenty-one".