21304232120 has 32 divisors (see below), whose sum is σ = 48746977200. Its totient is φ = 8377256448.

The previous prime is 21304232113. The next prime is 21304232129. The reversal of 21304232120 is 2123240312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21304232092 and 21304232101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304232129) 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, 4511249 + ... + 4515968.

Almost surely, 2^21304232120 is an apocalyptic number.

21304232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304232120 is an abundant number, since it is smaller than the sum of its proper divisors (27442745080).

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

21304232120 is a wasteful number, since it uses less digits than its factorization.

21304232120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027287 (or 9027283 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21304232120 its reverse (2123240312), we get a palindrome (23427472432).

The spelling of 21304232120 in words is "twenty-one billion, three hundred four million, two hundred thirty-two thousand, one hundred twenty".