21064326 has 32 divisors (see below), whose sum is σ = 45087840. Its totient is φ = 6537216.

The previous prime is 21064313. The next prime is 21064363. The reversal of 21064326 is 62346012.

It is a junction number, because it is equal to n+sod(n) for n = 21064296 and 21064305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8830 + ... + 10958.

It is an arithmetic number, because the mean of its divisors is an integer number (1408995).

Almost surely, 2^21064326 is an apocalyptic number.

21064326 is an abundant number, since it is smaller than the sum of its proper divisors (24023514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21064326 is a wasteful number, since it uses less digits than its factorization.

21064326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21064326 is about 4589.5888704763. The cubic root of 21064326 is about 276.1738297943.

The spelling of 21064326 in words is "twenty-one million, sixty-four thousand, three hundred twenty-six".