27297421 has 2 divisors, whose sum is σ = 27297422. Its totient is φ = 27297420.

The previous prime is 27297419. The next prime is 27297437. The reversal of 27297421 is 12479272.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 11655396 = 3955^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 27297421 - 2¹ = 27297419 is a prime.

Together with 27297419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27297451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13648710 + 13648711.

It is an arithmetic number, because the mean of its divisors is an integer number (13648711).

Almost surely, 2^27297421 is an apocalyptic number.

It is an amenable number.

27297421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27297421 is an equidigital number, since it uses as much as digits as its factorization.

27297421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 27297421 is about 5224.6933881329. The cubic root of 27297421 is about 301.0975390560.

The spelling of 27297421 in words is "twenty-seven million, two hundred ninety-seven thousand, four hundred twenty-one".