27777675221 has 16 divisors (see below), whose sum is σ = 28529424000. Its totient is φ = 27030967488.

The previous prime is 27777675217. The next prime is 27777675241. The reversal of 27777675221 is 12257677772.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 27777675221 - 2² = 27777675217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777675241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19854680 + ... + 19856078.

It is an arithmetic number, because the mean of its divisors is an integer number (1783089000).

Almost surely, 2^27777675221 is an apocalyptic number.

It is an amenable number.

27777675221 is a deficient number, since it is larger than the sum of its proper divisors (751748779).

27777675221 is a wasteful number, since it uses less digits than its factorization.

27777675221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828.

The product of its digits is 4033680, while the sum is 53.

The spelling of 27777675221 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred seventy-five thousand, two hundred twenty-one".