21554080536 has 32 divisors (see below), whose sum is σ = 53932005360. Its totient is φ = 7178452992.

The previous prime is 21554080519. The next prime is 21554080543. The reversal of 21554080536 is 63508045512.

It is a junction number, because it is equal to n+sod(n) for n = 21554080494 and 21554080503.

It is a congruent number.

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, 361785 + ... + 417128.

Almost surely, 2^21554080536 is an apocalyptic number.

It is an amenable number.

21554080536 is an abundant number, since it is smaller than the sum of its proper divisors (32377924824).

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

21554080536 is a wasteful number, since it uses less digits than its factorization.

21554080536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780075 (or 780071 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21554080536 in words is "twenty-one billion, five hundred fifty-four million, eighty thousand, five hundred thirty-six".