21012090110 has 32 divisors (see below), whose sum is σ = 41266102752. Its totient is φ = 7639649280.

The previous prime is 21012090097. The next prime is 21012090163. The reversal of 21012090110 is 1109021012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1373222 + ... + 1388438.

It is an arithmetic number, because the mean of its divisors is an integer number (1289565711).

Almost surely, 2^21012090110 is an apocalyptic number.

21012090110 is a deficient number, since it is larger than the sum of its proper divisors (20254012642).

21012090110 is a wasteful number, since it uses less digits than its factorization.

21012090110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27788.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21012090110 in words is "twenty-one billion, twelve million, ninety thousand, one hundred ten".