27901421 has 2 divisors, whose sum is σ = 27901422. Its totient is φ = 27901420.

The previous prime is 27901397. The next prime is 27901429. The reversal of 27901421 is 12410972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24700900 + 3200521 = 4970^2 + 1789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27901421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27901429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13950710 + 13950711.

It is an arithmetic number, because the mean of its divisors is an integer number (13950711).

Almost surely, 2^27901421 is an apocalyptic number.

It is an amenable number.

27901421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27901421 is an equidigital number, since it uses as much as digits as its factorization.

27901421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 27901421 is about 5282.1795690794. The cubic root of 27901421 is about 303.3021163651.

The spelling of 27901421 in words is "twenty-seven million, nine hundred one thousand, four hundred twenty-one".