21331202211220 has 48 divisors (see below), whose sum is σ = 51742424196288. Its totient is φ = 7300518402560.

The previous prime is 21331202211181. The next prime is 21331202211227. The reversal of 21331202211220 is 2211220213312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21331202211191 and 21331202211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331202211227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2851761262 + ... + 2851768741.

It is an arithmetic number, because the mean of its divisors is an integer number (1077967170756).

Almost surely, 2^{21331202211220} is an apocalyptic number.

21331202211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331202211220 is an abundant number, since it is smaller than the sum of its proper divisors (30411221985068).

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

21331202211220 is a wasteful number, since it uses less digits than its factorization.

21331202211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703530040 (or 5703530038 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21331202211220 its reverse (2211220213312), we get a palindrome (23542422424532).

The spelling of 21331202211220 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred two million, two hundred eleven thousand, two hundred twenty".