21100011120220 has 48 divisors (see below), whose sum is σ = 44436448536480. Its totient is φ = 8415949144064.

The previous prime is 21100011120191. The next prime is 21100011120277. The reversal of 21100011120220 is 2202111000112.

It is a self number, because there is not a number n which added to its sum of digits gives 21100011120220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12358392 + ... + 13961728.

It is an arithmetic number, because the mean of its divisors is an integer number (925759344510).

Almost surely, 2^{21100011120220} is an apocalyptic number.

21100011120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100011120220 is an abundant number, since it is smaller than the sum of its proper divisors (23336437416260).

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

21100011120220 is a wasteful number, since it uses less digits than its factorization.

21100011120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605222 (or 1605220 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100011120220 its reverse (2202111000112), we get a palindrome (23302122120332).

The spelling of 21100011120220 in words is "twenty-one trillion, one hundred billion, eleven million, one hundred twenty thousand, two hundred twenty".