21064426 has 16 divisors (see below), whose sum is σ = 33890400. Its totient is φ = 9788688.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064426 is 62446012.

It is a self number, because there is not a number n which added to its sum of digits gives 21064426.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3216 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (2118150).

Almost surely, 2^21064426 is an apocalyptic number.

21064426 is a deficient number, since it is larger than the sum of its proper divisors (12825974).

21064426 is a wasteful number, since it uses less digits than its factorization.

21064426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10533.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21064426 is about 4589.5997646854. The cubic root of 21064426 is about 276.1742668261.

The spelling of 21064426 in words is "twenty-one million, sixty-four thousand, four hundred twenty-six".