21222110112020 has 12 divisors (see below), whose sum is σ = 44566431235284. Its totient is φ = 8488844044800.

The previous prime is 21222110111963. The next prime is 21222110112089. The reversal of 21222110112020 is 2021101122212.

It can be written as a sum of positive squares in 2 ways, for example, as 11715025889284 + 9507084222736 = 3422722^2 + 3083356^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21222110112020.

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 3 ways as a sum of consecutive naturals, for example, 530552752781 + ... + 530552752820.

It is an arithmetic number, because the mean of its divisors is an integer number (3713869269607).

Almost surely, 2^{21222110112020} is an apocalyptic number.

21222110112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222110112020 is an abundant number, since it is smaller than the sum of its proper divisors (23344321123264).

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

21222110112020 is a wasteful number, since it uses less digits than its factorization.

21222110112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061105505610 (or 1061105505608 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21222110112020 its reverse (2021101122212), we get a palindrome (23243211234232).

The spelling of 21222110112020 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one hundred twelve thousand, twenty".