21304440472 has 32 divisors (see below), whose sum is σ = 46714060800. Its totient is φ = 8918136864.

The previous prime is 21304440397. The next prime is 21304440473. The reversal of 21304440472 is 27404440312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304440473) 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, 4421272 + ... + 4426087.

It is an arithmetic number, because the mean of its divisors is an integer number (1459814400).

Almost surely, 2^21304440472 is an apocalyptic number.

It is an amenable number.

21304440472 is an abundant number, since it is smaller than the sum of its proper divisors (25409620328).

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

21304440472 is a wasteful number, since it uses less digits than its factorization.

21304440472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8847415 (or 8847411 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 31.

Adding to 21304440472 its reverse (27404440312), we get a palindrome (48708880784).

The spelling of 21304440472 in words is "twenty-one billion, three hundred four million, four hundred forty thousand, four hundred seventy-two".