21204296 has 8 divisors (see below), whose sum is σ = 39758070. Its totient is φ = 10602144.

The previous prime is 21204251. The next prime is 21204329. The reversal of 21204296 is 69240212.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 828100 = 4514^2 + 910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325261 + ... + 1325276.

Almost surely, 2^21204296 is an apocalyptic number.

It is an amenable number.

21204296 is a deficient number, since it is larger than the sum of its proper divisors (18553774).

21204296 is a wasteful number, since it uses less digits than its factorization.

21204296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650543 (or 2650539 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21204296 is about 4604.8122654458. The cubic root of 21204296 is about 276.7841941925.

The spelling of 21204296 in words is "twenty-one million, two hundred four thousand, two hundred ninety-six".