21100311320 has 64 divisors (see below), whose sum is σ = 54043511040. Its totient is φ = 7339235200.

The previous prime is 21100311317. The next prime is 21100311341. The reversal of 21100311320 is 2311300112.

It is a junction number, because it is equal to n+sod(n) for n = 21100311295 and 21100311304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032386 + ... + 1052625.

It is an arithmetic number, because the mean of its divisors is an integer number (844429860).

Almost surely, 2^21100311320 is an apocalyptic number.

21100311320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100311320 is an abundant number, since it is smaller than the sum of its proper divisors (32943199720).

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

21100311320 is a wasteful number, since it uses less digits than its factorization.

21100311320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085056 (or 2085052 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21100311320 its reverse (2311300112), we get a palindrome (23411611432).

The spelling of 21100311320 in words is "twenty-one billion, one hundred million, three hundred eleven thousand, three hundred twenty".