21064627 has 2 divisors, whose sum is σ = 21064628. Its totient is φ = 21064626.

The previous prime is 21064621. The next prime is 21064679. The reversal of 21064627 is 72646012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21064627 - 2⁷ = 21064499 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21064595 and 21064604.

It is not a weakly prime, because it can be changed into another prime (21064621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532313 + 10532314.

It is an arithmetic number, because the mean of its divisors is an integer number (10532314).

Almost surely, 2^21064627 is an apocalyptic number.

21064627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064627 is an equidigital number, since it uses as much as digits as its factorization.

21064627 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 28.

The square root of 21064627 is about 4589.6216619674. The cubic root of 21064627 is about 276.1751452558.

The spelling of 21064627 in words is "twenty-one million, sixty-four thousand, six hundred twenty-seven".