21220211200220 has 24 divisors (see below), whose sum is σ = 47183763728304. Its totient is φ = 7988785392896.

The previous prime is 21220211200193. The next prime is 21220211200249. The reversal of 21220211200220 is 2200211202212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 31206192602 + ... + 31206193281.

It is an arithmetic number, because the mean of its divisors is an integer number (1965990155346).

Almost surely, 2^{21220211200220} is an apocalyptic number.

21220211200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220211200220 is an abundant number, since it is smaller than the sum of its proper divisors (25963552528084).

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

21220211200220 is a wasteful number, since it uses less digits than its factorization.

21220211200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62412385909 (or 62412385907 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220211200220 its reverse (2200211202212), we get a palindrome (23420422402432).

The spelling of 21220211200220 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, two hundred thousand, two hundred twenty".