21301473056 has 24 divisors (see below), whose sum is σ = 43070717340. Its totient is φ = 10362878208.

The previous prime is 21301473049. The next prime is 21301473071. The reversal of 21301473056 is 65037410312.

It can be written as a sum of positive squares in 2 ways, for example, as 19242128656 + 2059344400 = 138716^2 + 45380^2 .

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

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, 8994371 + ... + 8996738.

Almost surely, 2^21301473056 is an apocalyptic number.

It is an amenable number.

21301473056 is an abundant number, since it is smaller than the sum of its proper divisors (21769244284).

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

21301473056 is a wasteful number, since it uses less digits than its factorization.

21301473056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17991156 (or 17991148 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 21301473056 its reverse (65037410312), we get a palindrome (86338883368).

The spelling of 21301473056 in words is "twenty-one billion, three hundred one million, four hundred seventy-three thousand, fifty-six".