21064454 has 4 divisors (see below), whose sum is σ = 31596684. Its totient is φ = 10532226.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064454 is 45446012.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21064454² = 887422444636232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5266112 + ... + 5266115.

It is an arithmetic number, because the mean of its divisors is an integer number (7899171).

Almost surely, 2^21064454 is an apocalyptic number.

21064454 is a deficient number, since it is larger than the sum of its proper divisors (10532230).

21064454 is a wasteful number, since it uses less digits than its factorization.

21064454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532229.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 21064454 is about 4589.6028150593. The cubic root of 21064454 is about 276.1743891948.

The spelling of 21064454 in words is "twenty-one million, sixty-four thousand, four hundred fifty-four".