21012211220110 has 64 divisors (see below), whose sum is σ = 44929592179200. Its totient is φ = 6989047632000.

The previous prime is 21012211220101. The next prime is 21012211220123. The reversal of 21012211220110 is 1102211221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173278866 + ... + 173400085.

It is an arithmetic number, because the mean of its divisors is an integer number (702024877800).

Almost surely, 2^{21012211220110} is an apocalyptic number.

21012211220110 is an abundant number, since it is smaller than the sum of its proper divisors (23917380959090).

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

21012211220110 is a wasteful number, since it uses less digits than its factorization.

21012211220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346679017.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012211220110 its reverse (1102211221012), we get a palindrome (22114422441122).

The spelling of 21012211220110 in words is "twenty-one trillion, twelve billion, two hundred eleven million, two hundred twenty thousand, one hundred ten".