21201112110 has 32 divisors (see below), whose sum is σ = 52257879072. Its totient is φ = 5500828800.

The previous prime is 21201112087. The next prime is 21201112139. The reversal of 21201112110 is 1121110212.

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, 9548941 + ... + 9551160.

It is an arithmetic number, because the mean of its divisors is an integer number (1633058721).

Almost surely, 2^21201112110 is an apocalyptic number.

21201112110 is an abundant number, since it is smaller than the sum of its proper divisors (31056766962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201112110 is a wasteful number, since it uses less digits than its factorization.

21201112110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19100148.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21201112110 its reverse (1121110212), we get a palindrome (22322222322).

The spelling of 21201112110 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred ten".