21265796 has 12 divisors (see below), whose sum is σ = 37271052. Its totient is φ = 10616928.

The previous prime is 21265789. The next prime is 21265817. The reversal of 21265796 is 69756212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18800896 + 2464900 = 4336^2 + 1570^2 .

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, 695 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (3105921).

Almost surely, 2^21265796 is an apocalyptic number.

It is an amenable number.

21265796 is a deficient number, since it is larger than the sum of its proper divisors (16005256).

21265796 is a wasteful number, since it uses less digits than its factorization.

21265796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7990 (or 7988 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 21265796 is about 4611.4852271259. The cubic root of 21265796 is about 277.0515267741.

The spelling of 21265796 in words is "twenty-one million, two hundred sixty-five thousand, seven hundred ninety-six".