21064163 has 2 divisors, whose sum is σ = 21064164. Its totient is φ = 21064162.

The previous prime is 21064133. The next prime is 21064177. The reversal of 21064163 is 36146012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21064163 - 2⁸ = 21063907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21064133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532081 + 10532082.

It is an arithmetic number, because the mean of its divisors is an integer number (10532082).

Almost surely, 2^21064163 is an apocalyptic number.

21064163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064163 is an equidigital number, since it uses as much as digits as its factorization.

21064163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21064163 is about 4589.5711128601. The cubic root of 21064163 is about 276.1731174296.

The spelling of 21064163 in words is "twenty-one million, sixty-four thousand, one hundred sixty-three".