27813421 has 6 divisors (see below), whose sum is σ = 28082922. Its totient is φ = 27546480.

The previous prime is 27813403. The next prime is 27813427. The reversal of 27813421 is 12431872.

27813421 = T₂₃₈ + T₂₃₉ + ... + T₅₆₄.

It can be written as a sum of positive squares in 3 ways, for example, as 10797796 + 17015625 = 3286^2 + 4125^2 .

It is not a de Polignac number, because 27813421 - 2¹⁵ = 27780653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27813421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27813427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10711 + ... + 13051.

It is an arithmetic number, because the mean of its divisors is an integer number (4680487).

Almost surely, 2^27813421 is an apocalyptic number.

It is an amenable number.

27813421 is a deficient number, since it is larger than the sum of its proper divisors (269501).

27813421 is an equidigital number, since it uses as much as digits as its factorization.

27813421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559 (or 2450 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 27813421 is about 5273.8430958837. The cubic root of 27813421 is about 302.9829128393.

The spelling of 27813421 in words is "twenty-seven million, eight hundred thirteen thousand, four hundred twenty-one".