21203296 has 24 divisors (see below), whose sum is σ = 42033600. Its totient is φ = 10528128.

The previous prime is 21203293. The next prime is 21203317. The reversal of 21203296 is 69230212.

It is a happy number.

It is a super-2 number, since 2×21203296² = 899159522527232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21203296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2545 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (1751400).

Almost surely, 2^21203296 is an apocalyptic number.

It is an amenable number.

21203296 is a deficient number, since it is larger than the sum of its proper divisors (20830304).

21203296 is a wasteful number, since it uses less digits than its factorization.

21203296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606 (or 4598 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21203296 is about 4604.7036821059. The cubic root of 21203296 is about 276.7798430531.

The spelling of 21203296 in words is "twenty-one million, two hundred three thousand, two hundred ninety-six".