31221013030 has 16 divisors (see below), whose sum is σ = 56967657984. Its totient is φ = 12317330880.

The previous prime is 31221013007. The next prime is 31221013069. The reversal of 31221013030 is 3031012213.

It is a junction number, because it is equal to n+sod(n) for n = 31221012995 and 31221013013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21383526 + ... + 21384985.

It is an arithmetic number, because the mean of its divisors is an integer number (3560478624).

Almost surely, 2^31221013030 is an apocalyptic number.

31221013030 is a deficient number, since it is larger than the sum of its proper divisors (25746644954).

31221013030 is a wasteful number, since it uses less digits than its factorization.

31221013030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42768591.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31221013030 its reverse (3031012213), we get a palindrome (34252025243).

The spelling of 31221013030 in words is "thirty-one billion, two hundred twenty-one million, thirteen thousand, thirty".