21296756 has 24 divisors (see below), whose sum is σ = 41224680. Its totient is φ = 9562752.

The previous prime is 21296749. The next prime is 21296761. The reversal of 21296756 is 65769212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 739600 + 20557156 = 860^2 + 4534^2 .

It is a super-2 number, since 2×21296756² = 907103632247072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3611 + ... + 7458.

It is an arithmetic number, because the mean of its divisors is an integer number (1717695).

Almost surely, 2^21296756 is an apocalyptic number.

21296756 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21296756 is a deficient number, since it is larger than the sum of its proper divisors (19927924).

21296756 is a wasteful number, since it uses less digits than its factorization.

21296756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11123 (or 11121 counting only the distinct ones).

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

The square root of 21296756 is about 4614.8408423260. The cubic root of 21296756 is about 277.1859108978.

The spelling of 21296756 in words is "twenty-one million, two hundred ninety-six thousand, seven hundred fifty-six".