27863021 has 2 divisors, whose sum is σ = 27863022. Its totient is φ = 27863020.

The previous prime is 27862999. The next prime is 27863023. The reversal of 27863021 is 12036872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 184900 = 5261^2 + 430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27863021 is a prime.

Together with 27863023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27863023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13931510 + 13931511.

It is an arithmetic number, because the mean of its divisors is an integer number (13931511).

Almost surely, 2^27863021 is an apocalyptic number.

It is an amenable number.

27863021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27863021 is an equidigital number, since it uses as much as digits as its factorization.

27863021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 27863021 is about 5278.5434544010. The cubic root of 27863021 is about 303.1629102123.

Adding to 27863021 its reverse (12036872), we get a palindrome (39899893).

The spelling of 27863021 in words is "twenty-seven million, eight hundred sixty-three thousand, twenty-one".