21304115272 has 16 divisors (see below), whose sum is σ = 43576599600. Its totient is φ = 9683688720.

The previous prime is 21304115257. The next prime is 21304115297. The reversal of 21304115272 is 27251140312.

It is a self number, because there is not a number n which added to its sum of digits gives 21304115272.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121046022 + ... + 121046197.

It is an arithmetic number, because the mean of its divisors is an integer number (2723537475).

Almost surely, 2^21304115272 is an apocalyptic number.

21304115272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21304115272 is an abundant number, since it is smaller than the sum of its proper divisors (22272484328).

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

21304115272 is a wasteful number, since it uses less digits than its factorization.

21304115272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242092236 (or 242092232 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 21304115272 its reverse (27251140312), we get a palindrome (48555255584).

The spelling of 21304115272 in words is "twenty-one billion, three hundred four million, one hundred fifteen thousand, two hundred seventy-two".