31302231021 has 12 divisors (see below), whose sum is σ = 45466930080. Its totient is φ = 20751571080.

The previous prime is 31302231013. The next prime is 31302231047. The reversal of 31302231021 is 12013220313.

31302231021 is a `hidden beast` number, since 31 + 302 + 2 + 310 + 21 = 666.

It is not a de Polignac number, because 31302231021 - 2³ = 31302231013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31302230985 and 31302231003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302231011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9713545 + ... + 9716766.

It is an arithmetic number, because the mean of its divisors is an integer number (3788910840).

Almost surely, 2^31302231021 is an apocalyptic number.

It is an amenable number.

31302231021 is a deficient number, since it is larger than the sum of its proper divisors (14164699059).

31302231021 is a wasteful number, since it uses less digits than its factorization.

31302231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19430496 (or 19430493 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31302231021 its reverse (12013220313), we get a palindrome (43315451334).

The spelling of 31302231021 in words is "thirty-one billion, three hundred two million, two hundred thirty-one thousand, twenty-one".