27777304021 has 4 divisors (see below), whose sum is σ = 27856895500. Its totient is φ = 27697712544.

The previous prime is 27777304019. The next prime is 27777304031. The reversal of 27777304021 is 12040377772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20430414225 + 7346889796 = 142935^2 + 85714^2 .

It is a cyclic number.

It is not a de Polignac number, because 27777304021 - 2¹ = 27777304019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777304031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39795216 + ... + 39795913.

It is an arithmetic number, because the mean of its divisors is an integer number (6964223875).

Almost surely, 2^27777304021 is an apocalyptic number.

It is an amenable number.

27777304021 is a deficient number, since it is larger than the sum of its proper divisors (79591479).

27777304021 is an equidigital number, since it uses as much as digits as its factorization.

27777304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79591478.

The product of its (nonzero) digits is 115248, while the sum is 40.

The spelling of 27777304021 in words is "twenty-seven billion, seven hundred seventy-seven million, three hundred four thousand, twenty-one".