21100211120220 has 96 divisors (see below), whose sum is σ = 64196228167680. Its totient is φ = 5158625460480.

The previous prime is 21100211120203. The next prime is 21100211120249. The reversal of 21100211120220 is 2202111200112.

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 21100211120220.

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, 298496227 + ... + 298566906.

It is an arithmetic number, because the mean of its divisors is an integer number (668710710080).

Almost surely, 2^{21100211120220} is an apocalyptic number.

21100211120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100211120220 is an abundant number, since it is smaller than the sum of its proper divisors (43096017047460).

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

21100211120220 is a wasteful number, since it uses less digits than its factorization.

21100211120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597063195 (or 597063193 counting only the distinct ones).

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

Adding to 21100211120220 its reverse (2202111200112), we get a palindrome (23302322320332).

The spelling of 21100211120220 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, one hundred twenty thousand, two hundred twenty".