21704753 has 8 divisors (see below), whose sum is σ = 24950208. Its totient is φ = 18495504.

The previous prime is 21704737. The next prime is 21704791. The reversal of 21704753 is 35740712.

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

It is a cyclic number.

It is not a de Polignac number, because 21704753 - 2⁴ = 21704737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21704653) 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, 7751 + ... + 10172.

It is an arithmetic number, because the mean of its divisors is an integer number (3118776).

Almost surely, 2^21704753 is an apocalyptic number.

It is an amenable number.

21704753 is a deficient number, since it is larger than the sum of its proper divisors (3245455).

21704753 is a wasteful number, since it uses less digits than its factorization.

21704753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18103.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 21704753 is about 4658.8360134265. The cubic root of 21704753 is about 278.9448082226.

The spelling of 21704753 in words is "twenty-one million, seven hundred four thousand, seven hundred fifty-three".