21554013616 has 10 divisors (see below), whose sum is σ = 41760901412. Its totient is φ = 10777006800.

The previous prime is 21554013589. The next prime is 21554013629. The reversal of 21554013616 is 61631045512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673562910 + ... + 673562941.

Almost surely, 2^21554013616 is an apocalyptic number.

It is an amenable number.

21554013616 is a deficient number, since it is larger than the sum of its proper divisors (20206887796).

21554013616 is a wasteful number, since it uses less digits than its factorization.

21554013616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347125859 (or 1347125853 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 21554013616 in words is "twenty-one billion, five hundred fifty-four million, thirteen thousand, six hundred sixteen".