21311104203320 has 32 divisors (see below), whose sum is σ = 47950385583600. Its totient is φ = 8524370370048.

The previous prime is 21311104203299. The next prime is 21311104203343. The reversal of 21311104203320 is 2330240111312.

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, 2750147 + ... + 7084173.

Almost surely, 2^{21311104203320} is an apocalyptic number.

21311104203320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311104203320 is an abundant number, since it is smaller than the sum of its proper divisors (26639281380280).

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

21311104203320 is a wasteful number, since it uses less digits than its factorization.

21311104203320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456967 (or 4456963 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21311104203320 its reverse (2330240111312), we get a palindrome (23641344314632).

The spelling of 21311104203320 in words is "twenty-one trillion, three hundred eleven billion, one hundred four million, two hundred three thousand, three hundred twenty".