21300123320 has 32 divisors (see below), whose sum is σ = 54771746400. Its totient is φ = 7302899328.

The previous prime is 21300123211. The next prime is 21300123329. The reversal of 21300123320 is 2332100312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300123329) 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, 38035655 + ... + 38036214.

It is an arithmetic number, because the mean of its divisors is an integer number (1711617075).

Almost surely, 2^21300123320 is an apocalyptic number.

21300123320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300123320 is an abundant number, since it is smaller than the sum of its proper divisors (33471623080).

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

21300123320 is a wasteful number, since it uses less digits than its factorization.

21300123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76071887 (or 76071883 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21300123320 its reverse (2332100312), we get a palindrome (23632223632).

The spelling of 21300123320 in words is "twenty-one billion, three hundred million, one hundred twenty-three thousand, three hundred twenty".