21113556455 has 8 divisors (see below), whose sum is σ = 25582251552. Its totient is φ = 16726855968.

The previous prime is 21113556449. The next prime is 21113556469. The reversal of 21113556455 is 55465531112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113556455 - 2⁸ = 21113556199 is a prime.

It is a Duffinian number.

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, 20498084 + ... + 20499113.

It is an arithmetic number, because the mean of its divisors is an integer number (3197781444).

Almost surely, 2^21113556455 is an apocalyptic number.

21113556455 is a deficient number, since it is larger than the sum of its proper divisors (4468695097).

21113556455 is a wasteful number, since it uses less digits than its factorization.

21113556455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40997305.

The product of its digits is 90000, while the sum is 38.

The spelling of 21113556455 in words is "twenty-one billion, one hundred thirteen million, five hundred fifty-six thousand, four hundred fifty-five".