21478594552 has 16 divisors (see below), whose sum is σ = 40671102600. Its totient is φ = 10632967200.

The previous prime is 21478594541. The next prime is 21478594567. The reversal of 21478594552 is 25549587412.

It is a happy number.

It is a super-2 number, since 2×21478594552² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21478594552.

It is a congruent number.

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, 13290402 + ... + 13292017.

Almost surely, 2^21478594552 is an apocalyptic number.

It is an amenable number.

21478594552 is a deficient number, since it is larger than the sum of its proper divisors (19192508048).

21478594552 is a wasteful number, since it uses less digits than its factorization.

21478594552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26582526 (or 26582522 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 52.

The spelling of 21478594552 in words is "twenty-one billion, four hundred seventy-eight million, five hundred ninety-four thousand, five hundred fifty-two".