21559078352 has 40 divisors (see below), whose sum is σ = 48160447296. Its totient is φ = 9157833216.

The previous prime is 21559078319. The next prime is 21559078357. The reversal of 21559078352 is 25387095512.

It is a junction number, because it is equal to n+sod(n) for n = 21559078297 and 21559078306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21559078357) 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, 839078 + ... + 864389.

Almost surely, 2^21559078352 is an apocalyptic number.

It is an amenable number.

21559078352 is an abundant number, since it is smaller than the sum of its proper divisors (26601368944).

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

21559078352 is a wasteful number, since it uses less digits than its factorization.

21559078352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703595 (or 1703589 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 21559078352 in words is "twenty-one billion, five hundred fifty-nine million, seventy-eight thousand, three hundred fifty-two".