21113130320 has 40 divisors (see below), whose sum is σ = 50671518720. Its totient is φ = 8172823680.

The previous prime is 21113130317. The next prime is 21113130323. The reversal of 21113130320 is 2303131112.

It is an interprime number because it is at equal distance from previous prime (21113130317) and next prime (21113130323).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×21113130320⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113130323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4254200 + ... + 4259159.

It is an arithmetic number, because the mean of its divisors is an integer number (1266787968).

Almost surely, 2^21113130320 is an apocalyptic number.

21113130320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113130320 is an abundant number, since it is smaller than the sum of its proper divisors (29558388400).

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

21113130320 is a wasteful number, since it uses less digits than its factorization.

21113130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8513403 (or 8513397 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21113130320 its reverse (2303131112), we get a palindrome (23416261432).

The spelling of 21113130320 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty thousand, three hundred twenty".