21064325 has 12 divisors (see below), whose sum is σ = 26203680. Its totient is φ = 16797360.

The previous prime is 21064313. The next prime is 21064363. The reversal of 21064325 is 52346012.

It is not a de Polignac number, because 21064325 - 2⁶ = 21064261 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21064325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7802 + ... + 10148.

It is an arithmetic number, because the mean of its divisors is an integer number (2183640).

Almost surely, 2^21064325 is an apocalyptic number.

21064325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21064325 is a deficient number, since it is larger than the sum of its proper divisors (5139355).

21064325 is a wasteful number, since it uses less digits than its factorization.

21064325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716 (or 2711 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21064325 is about 4589.5887615341. The cubic root of 21064325 is about 276.1738254240.

The spelling of 21064325 in words is "twenty-one million, sixty-four thousand, three hundred twenty-five".