21554080557 has 8 divisors (see below), whose sum is σ = 28749544320. Its totient is φ = 14364001920.

The previous prime is 21554080543. The next prime is 21554080571. The reversal of 21554080557 is 75508045512.

It is an interprime number because it is at equal distance from previous prime (21554080543) and next prime (21554080571).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21554080557 - 2¹⁴ = 21554064173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554080517) 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, 1336932 + ... + 1352957.

It is an arithmetic number, because the mean of its divisors is an integer number (3593693040).

Almost surely, 2^21554080557 is an apocalyptic number.

It is an amenable number.

21554080557 is a deficient number, since it is larger than the sum of its proper divisors (7195463763).

21554080557 is a wasteful number, since it uses less digits than its factorization.

21554080557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692563.

The product of its (nonzero) digits is 280000, while the sum is 42.

The spelling of 21554080557 in words is "twenty-one billion, five hundred fifty-four million, eighty thousand, five hundred fifty-seven".