21554562470 has 128 divisors (see below), whose sum is σ = 47396966400. Its totient is φ = 7041323520.

The previous prime is 21554562451. The next prime is 21554562487. The reversal of 21554562470 is 7426545512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34159055 + ... + 34159685.

It is an arithmetic number, because the mean of its divisors is an integer number (370288800).

Almost surely, 2^21554562470 is an apocalyptic number.

21554562470 is an abundant number, since it is smaller than the sum of its proper divisors (25842403930).

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

21554562470 is a wasteful number, since it uses less digits than its factorization.

21554562470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 41.

The spelling of 21554562470 in words is "twenty-one billion, five hundred fifty-four million, five hundred sixty-two thousand, four hundred seventy".