21103232320 has 56 divisors (see below), whose sum is σ = 52436962944. Its totient is φ = 8074277376.

The previous prime is 21103232263. The next prime is 21103232333. The reversal of 21103232320 is 2323230112.

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, 1426284 + ... + 1441003.

Almost surely, 2^21103232320 is an apocalyptic number.

21103232320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103232320 is an abundant number, since it is smaller than the sum of its proper divisors (31333730624).

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

21103232320 is a wasteful number, since it uses less digits than its factorization.

21103232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867327 (or 2867317 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21103232320 its reverse (2323230112), we get a palindrome (23426462432).

The spelling of 21103232320 in words is "twenty-one billion, one hundred three million, two hundred thirty-two thousand, three hundred twenty".