21100122021120 has 72 divisors (see below), whose sum is σ = 67388514717216. Its totient is φ = 5626699204608.

The previous prime is 21100122021113. The next prime is 21100122021239. The reversal of 21100122021120 is 2112022100112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21100122021120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2747407882 + ... + 2747415561.

Almost surely, 2^{21100122021120} is an apocalyptic number.

21100122021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100122021120 is an abundant number, since it is smaller than the sum of its proper divisors (46288392696096).

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

21100122021120 is an equidigital number, since it uses as much as digits as its factorization.

21100122021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494823467 (or 5494823453 counting only the distinct ones).

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

Adding to 21100122021120 its reverse (2112022100112), we get a palindrome (23212144121232).

The spelling of 21100122021120 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty".