21455316032 has 14 divisors (see below), whose sum is σ = 42575392878. Its totient is φ = 10727657984.

The previous prime is 21455316011. The next prime is 21455316151. The reversal of 21455316032 is 23061355412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18272550976 + 3182765056 = 135176^2 + 56416^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21455316032.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167619593 + ... + 167619720.

Almost surely, 2^21455316032 is an apocalyptic number.

It is an amenable number.

21455316032 is a deficient number, since it is larger than the sum of its proper divisors (21120076846).

21455316032 is an equidigital number, since it uses as much as digits as its factorization.

21455316032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335239325 (or 335239315 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21455316032 in words is "twenty-one billion, four hundred fifty-five million, three hundred sixteen thousand, thirty-two".