31004122621 has 4 divisors (see below), whose sum is σ = 31047852700. Its totient is φ = 30960392544.

The previous prime is 31004122603. The next prime is 31004122627. The reversal of 31004122621 is 12622140013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6290710596 + 24713412025 = 79314^2 + 157205^2 .

It is a cyclic number.

It is not a de Polignac number, because 31004122621 - 2⁷ = 31004122493 is a prime.

It is a super-2 number, since 2×31004122621² (a number of 22 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 = 31004122592 and 31004122601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31004122627) 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, 21863976 + ... + 21865393.

It is an arithmetic number, because the mean of its divisors is an integer number (7761963175).

Almost surely, 2^31004122621 is an apocalyptic number.

It is an amenable number.

31004122621 is a deficient number, since it is larger than the sum of its proper divisors (43730079).

31004122621 is an equidigital number, since it uses as much as digits as its factorization.

31004122621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43730078.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 31004122621 its reverse (12622140013), we get a palindrome (43626262634).

The spelling of 31004122621 in words is "thirty-one billion, four million, one hundred twenty-two thousand, six hundred twenty-one".