27657441721 has 32 divisors (see below), whose sum is σ = 34573271040. Its totient is φ = 21541605696.

The previous prime is 27657441697. The next prime is 27657441733. The reversal of 27657441721 is 12714475672.

It is not a de Polignac number, because 27657441721 - 2²⁷ = 27523223993 is a prime.

It is a super-2 number, since 2×27657441721² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27657442721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2489040 + ... + 2500126.

It is an arithmetic number, because the mean of its divisors is an integer number (1080414720).

Almost surely, 2^27657441721 is an apocalyptic number.

It is an amenable number.

27657441721 is a deficient number, since it is larger than the sum of its proper divisors (6915829319).

27657441721 is a wasteful number, since it uses less digits than its factorization.

27657441721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11533.

The product of its digits is 658560, while the sum is 46.

The spelling of 27657441721 in words is "twenty-seven billion, six hundred fifty-seven million, four hundred forty-one thousand, seven hundred twenty-one".