21454753 has 4 divisors (see below), whose sum is σ = 21713328. Its totient is φ = 21196180.

The previous prime is 21454747. The next prime is 21454777. The reversal of 21454753 is 35745412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21454753 - 2²¹ = 19357601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129163 + ... + 129328.

It is an arithmetic number, because the mean of its divisors is an integer number (5428332).

Almost surely, 2^21454753 is an apocalyptic number.

It is an amenable number.

21454753 is a deficient number, since it is larger than the sum of its proper divisors (258575).

21454753 is an equidigital number, since it uses as much as digits as its factorization.

21454753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258574.

The product of its digits is 16800, while the sum is 31.

The square root of 21454753 is about 4631.9275685183. The cubic root of 21454753 is about 277.8696877310.

The spelling of 21454753 in words is "twenty-one million, four hundred fifty-four thousand, seven hundred fifty-three".