21494753 has 16 divisors (see below), whose sum is σ = 25355520. Its totient is φ = 17841600.

The previous prime is 21494729. The next prime is 21494779. The reversal of 21494753 is 35749412.

It is not a de Polignac number, because 21494753 - 2⁶ = 21494689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21494723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29963 + ... + 30671.

It is an arithmetic number, because the mean of its divisors is an integer number (1584720).

Almost surely, 2^21494753 is an apocalyptic number.

It is an amenable number.

21494753 is a deficient number, since it is larger than the sum of its proper divisors (3860767).

21494753 is an equidigital number, since it uses as much as digits as its factorization.

21494753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848.

The product of its digits is 30240, while the sum is 35.

The square root of 21494753 is about 4636.2434146623. The cubic root of 21494753 is about 278.0422662303.

The spelling of 21494753 in words is "twenty-one million, four hundred ninety-four thousand, seven hundred fifty-three".