21296775 has 12 divisors (see below), whose sum is σ = 35210792. Its totient is φ = 11358240.

The previous prime is 21296773. The next prime is 21296791. The reversal of 21296775 is 57769212.

It is not a de Polignac number, because 21296775 - 2¹ = 21296773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296773) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 141904 + ... + 142053.

Almost surely, 2^21296775 is an apocalyptic number.

21296775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21296775 is a deficient number, since it is larger than the sum of its proper divisors (13914017).

21296775 is a wasteful number, since it uses less digits than its factorization.

21296775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283970 (or 283965 counting only the distinct ones).

The product of its digits is 52920, while the sum is 39.

The square root of 21296775 is about 4614.8429009014. The cubic root of 21296775 is about 277.1859933287.

The spelling of 21296775 in words is "twenty-one million, two hundred ninety-six thousand, seven hundred seventy-five".