21064193 has 2 divisors, whose sum is σ = 21064194. Its totient is φ = 21064192.

The previous prime is 21064189. The next prime is 21064231. The reversal of 21064193 is 39146012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 4032064 = 4127^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 21064193 - 2² = 21064189 is a prime.

It is equal to p_1333808 and since 21064193 and 1333808 have the same sum of digits, it is a Honaker 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, 10532096 + 10532097.

It is an arithmetic number, because the mean of its divisors is an integer number (10532097).

Almost surely, 2^21064193 is an apocalyptic number.

It is an amenable number.

21064193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064193 is an equidigital number, since it uses as much as digits as its factorization.

21064193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21064193 is about 4589.5743811382. The cubic root of 21064193 is about 276.1732485399.

The spelling of 21064193 in words is "twenty-one million, sixty-four thousand, one hundred ninety-three".