21379027 has 2 divisors, whose sum is σ = 21379028. Its totient is φ = 21379026.

The previous prime is 21379021. The next prime is 21379049. The reversal of 21379027 is 72097312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21379027 - 2³ = 21379019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21379027.

It is not a weakly prime, because it can be changed into another prime (21379021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10689513 + 10689514.

It is an arithmetic number, because the mean of its divisors is an integer number (10689514).

Almost surely, 2^21379027 is an apocalyptic number.

21379027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21379027 is an equidigital number, since it uses as much as digits as its factorization.

21379027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21379027 is about 4623.7459921583. The cubic root of 21379027 is about 277.5423824020.

The spelling of 21379027 in words is "twenty-one million, three hundred seventy-nine thousand, twenty-seven".