21753453 has 8 divisors (see below), whose sum is σ = 29043616. Its totient is φ = 14482800.

The previous prime is 21753419. The next prime is 21753533. The reversal of 21753453 is 35435712.

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

It is not a de Polignac number, because 21753453 - 2¹⁰ = 21752429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21753453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21743453) 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, 2038 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (3630452).

Almost surely, 2^21753453 is an apocalyptic number.

It is an amenable number.

21753453 is a deficient number, since it is larger than the sum of its proper divisors (7290163).

21753453 is an equidigital number, since it uses as much as digits as its factorization.

21753453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9755.

The product of its digits is 12600, while the sum is 30.

The square root of 21753453 is about 4664.0597123107. The cubic root of 21753453 is about 279.1532796828.

The spelling of 21753453 in words is "twenty-one million, seven hundred fifty-three thousand, four hundred fifty-three".