21064762 has 8 divisors (see below), whose sum is σ = 31910292. Its totient is φ = 10428000.

The previous prime is 21064753. The next prime is 21064781. The reversal of 21064762 is 26746012.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 1164241 = 4461^2 + 1079^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21064762.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51939 + ... + 52342.

Almost surely, 2^21064762 is an apocalyptic number.

21064762 is a deficient number, since it is larger than the sum of its proper divisors (10845530).

21064762 is a wasteful number, since it uses less digits than its factorization.

21064762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104384.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21064762 is about 4589.6363690384. The cubic root of 21064762 is about 276.1757352427.

The spelling of 21064762 in words is "twenty-one million, sixty-four thousand, seven hundred sixty-two".