27256421 has 4 divisors (see below), whose sum is σ = 27439500. Its totient is φ = 27073344.

The previous prime is 27256417. The next prime is 27256451. The reversal of 27256421 is 12465272.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 11937025 = 3914^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 27256421 - 2² = 27256417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27256451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91316 + ... + 91613.

It is an arithmetic number, because the mean of its divisors is an integer number (6859875).

Almost surely, 2^27256421 is an apocalyptic number.

It is an amenable number.

27256421 is a deficient number, since it is larger than the sum of its proper divisors (183079).

27256421 is a wasteful number, since it uses less digits than its factorization.

27256421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183078.

The product of its digits is 6720, while the sum is 29.

The square root of 27256421 is about 5220.7682384875. The cubic root of 27256421 is about 300.9467166898.

The spelling of 27256421 in words is "twenty-seven million, two hundred fifty-six thousand, four hundred twenty-one".