21020312122320 has 120 divisors (see below), whose sum is σ = 75801819471264. Its totient is φ = 4804642768128.

The previous prime is 21020312122319. The next prime is 21020312122333. The reversal of 21020312122320 is 2322121302012.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 893708994 + ... + 893732513.

Almost surely, 2^{21020312122320} is an apocalyptic number.

21020312122320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020312122320 is an abundant number, since it is smaller than the sum of its proper divisors (54781507348944).

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

21020312122320 is a wasteful number, since it uses less digits than its factorization.

21020312122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787441537 (or 1787441524 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21020312122320 its reverse (2322121302012), we get a palindrome (23342433424332).

The spelling of 21020312122320 in words is "twenty-one trillion, twenty billion, three hundred twelve million, one hundred twenty-two thousand, three hundred twenty".