21294753 has 8 divisors (see below), whose sum is σ = 28528416. Its totient is φ = 14128800.

The previous prime is 21294731. The next prime is 21294773. The reversal of 21294753 is 35749212.

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

It is not a de Polignac number, because 21294753 - 2²² = 17100449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21294773) 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, 16188 + ... + 17453.

It is an arithmetic number, because the mean of its divisors is an integer number (3566052).

Almost surely, 2^21294753 is an apocalyptic number.

It is an amenable number.

21294753 is a deficient number, since it is larger than the sum of its proper divisors (7233663).

21294753 is a wasteful number, since it uses less digits than its factorization.

21294753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33855.

The product of its digits is 15120, while the sum is 33.

The square root of 21294753 is about 4614.6238199879. The cubic root of 21294753 is about 277.1772206731.

The spelling of 21294753 in words is "twenty-one million, two hundred ninety-four thousand, seven hundred fifty-three".