31210213105 has 16 divisors (see below), whose sum is σ = 40782859200. Its totient is φ = 22838397120.

The previous prime is 31210213063. The next prime is 31210213123. The reversal of 31210213105 is 50131201213.

It is a de Polignac number, because none of the positive numbers 2^k-31210213105 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5661531 + ... + 5667040.

It is an arithmetic number, because the mean of its divisors is an integer number (2548928700).

Almost surely, 2^31210213105 is an apocalyptic number.

It is an amenable number.

31210213105 is a deficient number, since it is larger than the sum of its proper divisors (9572646095).

31210213105 is a wasteful number, since it uses less digits than its factorization.

31210213105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11328624.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 31210213105 its reverse (50131201213), we get a palindrome (81341414318).

The spelling of 31210213105 in words is "thirty-one billion, two hundred ten million, two hundred thirteen thousand, one hundred five".