21294453 has 4 divisors (see below), whose sum is σ = 28392608. Its totient is φ = 14196300.

The previous prime is 21294451. The next prime is 21294487. The reversal of 21294453 is 35449212.

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 not a de Polignac number, because 21294453 - 2¹ = 21294451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21294453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294451) 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, 3549073 + ... + 3549078.

It is an arithmetic number, because the mean of its divisors is an integer number (7098152).

Almost surely, 2^21294453 is an apocalyptic number.

It is an amenable number.

21294453 is a deficient number, since it is larger than the sum of its proper divisors (7098155).

21294453 is an equidigital number, since it uses as much as digits as its factorization.

21294453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7098154.

The product of its digits is 8640, while the sum is 30.

The square root of 21294453 is about 4614.5913145153. The cubic root of 21294453 is about 277.1759190448.

The spelling of 21294453 in words is "twenty-one million, two hundred ninety-four thousand, four hundred fifty-three".