27021457 has 2 divisors, whose sum is σ = 27021458. Its totient is φ = 27021456.

The previous prime is 27021451. The next prime is 27021473. The reversal of 27021457 is 75412072.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24512401 + 2509056 = 4951^2 + 1584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27021457 is a prime.

It is equal to p_1684324 and since 27021457 and 1684324 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (27021451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13510728 + 13510729.

It is an arithmetic number, because the mean of its divisors is an integer number (13510729).

Almost surely, 2^27021457 is an apocalyptic number.

It is an amenable number.

27021457 is a deficient number, since it is larger than the sum of its proper divisors (1).

27021457 is an equidigital number, since it uses as much as digits as its factorization.

27021457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 27021457 is about 5198.2167134509. The cubic root of 27021457 is about 300.0794493279.

The spelling of 27021457 in words is "twenty-seven million, twenty-one thousand, four hundred fifty-seven".