27982021 has 2 divisors, whose sum is σ = 27982022. Its totient is φ = 27982020.

The previous prime is 27982001. The next prime is 27982067. The reversal of 27982021 is 12028972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26061025 + 1920996 = 5105^2 + 1386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27982021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27982001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13991010 + 13991011.

It is an arithmetic number, because the mean of its divisors is an integer number (13991011).

Almost surely, 2^27982021 is an apocalyptic number.

It is an amenable number.

27982021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27982021 is an equidigital number, since it uses as much as digits as its factorization.

27982021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 27982021 is about 5289.8034935147. The cubic root of 27982021 is about 303.5938894226.

It can be divided in two parts, 279820 and 21, that added together give a 4-th power (279841 = 23⁴).

The spelling of 27982021 in words is "twenty-seven million, nine hundred eighty-two thousand, twenty-one".