21775313055 has 8 divisors (see below), whose sum is σ = 34840500912. Its totient is φ = 11613500288.

The previous prime is 21775313029. The next prime is 21775313081. The reversal of 21775313055 is 55031357712.

It is an interprime number because it is at equal distance from previous prime (21775313029) and next prime (21775313081).

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 21775313055 - 2⁶ = 21775312991 is a prime.

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, 725843754 + ... + 725843783.

It is an arithmetic number, because the mean of its divisors is an integer number (4355062614).

Almost surely, 2^21775313055 is an apocalyptic number.

21775313055 is a deficient number, since it is larger than the sum of its proper divisors (13065187857).

21775313055 is a wasteful number, since it uses less digits than its factorization.

21775313055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451687545.

The product of its (nonzero) digits is 110250, while the sum is 39.

The spelling of 21775313055 in words is "twenty-one billion, seven hundred seventy-five million, three hundred thirteen thousand, fifty-five".