31221322130 has 16 divisors (see below), whose sum is σ = 56290068504. Its totient is φ = 12468153600.

The previous prime is 31221322073. The next prime is 31221322157. The reversal of 31221322130 is 3122312213.

It can be written as a sum of positive squares in 4 ways, for example, as 6887506081 + 24333816049 = 82991^2 + 155993^2 .

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, 2540471 + ... + 2552730.

Almost surely, 2^31221322130 is an apocalyptic number.

31221322130 is a deficient number, since it is larger than the sum of its proper divisors (25068746374).

31221322130 is a wasteful number, since it uses less digits than its factorization.

31221322130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093821.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31221322130 its reverse (3122312213), we get a palindrome (34343634343).

The spelling of 31221322130 in words is "thirty-one billion, two hundred twenty-one million, three hundred twenty-two thousand, one hundred thirty".