21321312202320 has 80 divisors (see below), whose sum is σ = 71180380747392. Its totient is φ = 5248323002880.

The previous prime is 21321312202297. The next prime is 21321312202381. The reversal of 21321312202320 is 2320221312312.

21321312202320 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21321312202320² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3416873836 + ... + 3416880075.

Almost surely, 2^{21321312202320} is an apocalyptic number.

21321312202320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321312202320 is an abundant number, since it is smaller than the sum of its proper divisors (49859068545072).

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

21321312202320 is a wasteful number, since it uses less digits than its factorization.

21321312202320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833753940 (or 6833753934 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21321312202320 its reverse (2320221312312), we get a palindrome (23641533514632).

The spelling of 21321312202320 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twelve million, two hundred two thousand, three hundred twenty".