21200210111220 has 96 divisors (see below), whose sum is σ = 68769996734208. Its totient is φ = 4779381998592.

The previous prime is 21200210111183. The next prime is 21200210111257. The reversal of 21200210111220 is 2211101200212.

It is an interprime number because it is at equal distance from previous prime (21200210111183) and next prime (21200210111257).

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 21200210111220.

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 31 ways as a sum of consecutive naturals, for example, 345700099 + ... + 345761418.

It is an arithmetic number, because the mean of its divisors is an integer number (716354132648).

Almost surely, 2^{21200210111220} is an apocalyptic number.

21200210111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200210111220 is an abundant number, since it is smaller than the sum of its proper divisors (47569786622988).

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

21200210111220 is a wasteful number, since it uses less digits than its factorization.

21200210111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691461609 (or 691461607 counting only the distinct ones).

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

Adding to 21200210111220 its reverse (2211101200212), we get a palindrome (23411311311432).

The spelling of 21200210111220 in words is "twenty-one trillion, two hundred billion, two hundred ten million, one hundred eleven thousand, two hundred twenty".