27232721 has 2 divisors, whose sum is σ = 27232722. Its totient is φ = 27232720.

The previous prime is 27232697. The next prime is 27232729. The reversal of 27232721 is 12723272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 192721 = 5200^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 27232721 - 2¹⁰ = 27231697 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (27232729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13616360 + 13616361.

It is an arithmetic number, because the mean of its divisors is an integer number (13616361).

Almost surely, 2^27232721 is an apocalyptic number.

It is an amenable number.

27232721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27232721 is an equidigital number, since it uses as much as digits as its factorization.

27232721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2352, while the sum is 26.

The square root of 27232721 is about 5218.4979639739. The cubic root of 27232721 is about 300.8594650112.

Adding to 27232721 its reverse (12723272), we get a palindrome (39955993).

The spelling of 27232721 in words is "twenty-seven million, two hundred thirty-two thousand, seven hundred twenty-one".