21296757 has 8 divisors (see below), whose sum is σ = 28619776. Its totient is φ = 14085792.

The previous prime is 21296749. The next prime is 21296761. The reversal of 21296757 is 75769212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21296757 - 2³ = 21296749 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 (21296707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27568 + ... + 28329.

It is an arithmetic number, because the mean of its divisors is an integer number (3577472).

Almost surely, 2^21296757 is an apocalyptic number.

It is an amenable number.

21296757 is a deficient number, since it is larger than the sum of its proper divisors (7323019).

21296757 is a wasteful number, since it uses less digits than its factorization.

21296757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56027.

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

The square root of 21296757 is about 4614.8409506721. The cubic root of 21296757 is about 277.1859152363.

It can be divided in two parts, 212 and 96757, that added together give a palindrome (96969).

The spelling of 21296757 in words is "twenty-one million, two hundred ninety-six thousand, seven hundred fifty-seven".