21304351504 has 40 divisors (see below), whose sum is σ = 42425420760. Its totient is φ = 10359782400.

The previous prime is 21304351493. The next prime is 21304351517. The reversal of 21304351504 is 40515340312.

It can be written as a sum of positive squares in 4 ways, for example, as 1270779904 + 20033571600 = 35648^2 + 141540^2 .

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, 35767 + ... + 209494.

It is an arithmetic number, because the mean of its divisors is an integer number (1060635519).

Almost surely, 2^21304351504 is an apocalyptic number.

It is an amenable number.

21304351504 is a deficient number, since it is larger than the sum of its proper divisors (21121069256).

21304351504 is a wasteful number, since it uses less digits than its factorization.

21304351504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245419 (or 245413 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21304351504 its reverse (40515340312), we get a palindrome (61819691816).

The spelling of 21304351504 in words is "twenty-one billion, three hundred four million, three hundred fifty-one thousand, five hundred four".