21031310110 has 32 divisors (see below), whose sum is σ = 39565532160. Its totient is φ = 8038689792.

The previous prime is 21031310099. The next prime is 21031310141. The reversal of 21031310110 is 1101313012.

It is a congruent number.

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, 345694 + ... + 401953.

It is an arithmetic number, because the mean of its divisors is an integer number (1236422880).

Almost surely, 2^21031310110 is an apocalyptic number.

21031310110 is a deficient number, since it is larger than the sum of its proper divisors (18534222050).

21031310110 is a wasteful number, since it uses less digits than its factorization.

21031310110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747780.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21031310110 its reverse (1101313012), we get a palindrome (22132623122).

The spelling of 21031310110 in words is "twenty-one billion, thirty-one million, three hundred ten thousand, one hundred ten".