21064159 has 12 divisors (see below), whose sum is σ = 22735728. Its totient is φ = 19477920.

The previous prime is 21064133. The next prime is 21064163. The reversal of 21064159 is 95146012.

It is not a de Polignac number, because 21064159 - 2⁷ = 21064031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21627 + ... + 22579.

It is an arithmetic number, because the mean of its divisors is an integer number (1894644).

Almost surely, 2^21064159 is an apocalyptic number.

21064159 is a deficient number, since it is larger than the sum of its proper divisors (1671569).

21064159 is an equidigital number, since it uses as much as digits as its factorization.

21064159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21064159 is about 4589.5706770895. The cubic root of 21064159 is about 276.1730999482.

The spelling of 21064159 in words is "twenty-one million, sixty-four thousand, one hundred fifty-nine".