21100122112020 has 144 divisors (see below), whose sum is σ = 68730616543680. Its totient is φ = 4822568948736.

The previous prime is 21100122111989. The next prime is 21100122112057. The reversal of 21100122112020 is 2021122100112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46186476 + ... + 46641084.

It is an arithmetic number, because the mean of its divisors is an integer number (477295948220).

Almost surely, 2^{21100122112020} is an apocalyptic number.

21100122112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100122112020 is an abundant number, since it is smaller than the sum of its proper divisors (47630494431660).

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

21100122112020 is a wasteful number, since it uses less digits than its factorization.

21100122112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470422 (or 470413 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21100122112020 its reverse (2021122100112), we get a palindrome (23121244212132).

The spelling of 21100122112020 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, one hundred twelve thousand, twenty".