31203220013 has 16 divisors (see below), whose sum is σ = 35878809600. Its totient is φ = 26582530416.

The previous prime is 31203219977. The next prime is 31203220019. The reversal of 31203220013 is 31002230213.

It is a cyclic number.

It is not a de Polignac number, because 31203220013 - 2⁸ = 31203219757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31203219973 and 31203220000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203220019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 935420 + ... + 968202.

It is an arithmetic number, because the mean of its divisors is an integer number (2242425600).

Almost surely, 2^31203220013 is an apocalyptic number.

It is an amenable number.

31203220013 is a deficient number, since it is larger than the sum of its proper divisors (4675589587).

31203220013 is a wasteful number, since it uses less digits than its factorization.

31203220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33616.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31203220013 its reverse (31002230213), we get a palindrome (62205450226).

The spelling of 31203220013 in words is "thirty-one billion, two hundred three million, two hundred twenty thousand, thirteen".