21203321323220 has 24 divisors (see below), whose sum is σ = 44527091481600. Its totient is φ = 8481306300192.

The previous prime is 21203321323213. The next prime is 21203321323273. The reversal of 21203321323220 is 2232312330212.

It is a super-2 number, since 2×21203321323220² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21203321323220.

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, 7970141 + ... + 10292219.

It is an arithmetic number, because the mean of its divisors is an integer number (1855295478400).

Almost surely, 2^{21203321323220} is an apocalyptic number.

21203321323220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203321323220 is an abundant number, since it is smaller than the sum of its proper divisors (23323770158380).

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

21203321323220 is a wasteful number, since it uses less digits than its factorization.

21203321323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778647 (or 2778645 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21203321323220 its reverse (2232312330212), we get a palindrome (23435633653432).

The spelling of 21203321323220 in words is "twenty-one trillion, two hundred three billion, three hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty".