27297021 has 16 divisors (see below), whose sum is σ = 38908800. Its totient is φ = 16980480.

The previous prime is 27297013. The next prime is 27297031. The reversal of 27297021 is 12079272.

It is a happy number.

It is not a de Polignac number, because 27297021 - 2³ = 27297013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27297021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27297001) 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, 1996 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (2431800).

Almost surely, 2^27297021 is an apocalyptic number.

It is an amenable number.

27297021 is a deficient number, since it is larger than the sum of its proper divisors (11611779).

27297021 is a wasteful number, since it uses less digits than its factorization.

27297021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9716.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 27297021 is about 5224.6551082344. The cubic root of 27297021 is about 301.0960683481.

The spelling of 27297021 in words is "twenty-seven million, two hundred ninety-seven thousand, twenty-one".