27442721 has 2 divisors, whose sum is σ = 27442722. Its totient is φ = 27442720.

The previous prime is 27442699. The next prime is 27442733. The reversal of 27442721 is 12724472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 10336225 = 4136^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 27442721 - 2¹⁴ = 27426337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27442621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13721360 + 13721361.

It is an arithmetic number, because the mean of its divisors is an integer number (13721361).

Almost surely, 2^27442721 is an apocalyptic number.

It is an amenable number.

27442721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27442721 is an equidigital number, since it uses as much as digits as its factorization.

27442721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 29.

The square root of 27442721 is about 5238.5800557021. The cubic root of 27442721 is about 301.6308260314.

The spelling of 27442721 in words is "twenty-seven million, four hundred forty-two thousand, seven hundred twenty-one".