21750753 has 8 divisors (see below), whose sum is σ = 29039616. Its totient is φ = 14481200.

The previous prime is 21750737. The next prime is 21750793. The reversal of 21750753 is 35705712.

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 21750753 - 2⁴ = 21750737 is a prime.

It is a super-3 number, since 3×21750753³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21750753.

It is not an unprimeable number, because it can be changed into a prime (21750793) 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, 1953 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (3629952).

Almost surely, 2^21750753 is an apocalyptic number.

It is an amenable number.

21750753 is a deficient number, since it is larger than the sum of its proper divisors (7288863).

21750753 is an equidigital number, since it uses as much as digits as its factorization.

21750753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9655.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 21750753 is about 4663.7702559196. The cubic root of 21750753 is about 279.1417298683.

The spelling of 21750753 in words is "twenty-one million, seven hundred fifty thousand, seven hundred fifty-three".