31004412021 has 24 divisors (see below), whose sum is σ = 51426779040. Its totient is φ = 17801575200.

The previous prime is 31004412007. The next prime is 31004412037. The reversal of 31004412021 is 12021440013.

It is not a de Polignac number, because 31004412021 - 2¹⁴ = 31004395637 is a prime.

It is a super-2 number, since 2×31004412021² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31004411985 and 31004412003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31004412041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8239590 + ... + 8243351.

It is an arithmetic number, because the mean of its divisors is an integer number (2142782460).

Almost surely, 2^31004412021 is an apocalyptic number.

It is an amenable number.

31004412021 is a deficient number, since it is larger than the sum of its proper divisors (20422367019).

31004412021 is a wasteful number, since it uses less digits than its factorization.

31004412021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16482977 (or 16482974 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 31004412021 its reverse (12021440013), we get a palindrome (43025852034).

The spelling of 31004412021 in words is "thirty-one billion, four million, four hundred twelve thousand, twenty-one".