21828453 has 8 divisors (see below), whose sum is σ = 29514816. Its totient is φ = 14347200.

The previous prime is 21828437. The next prime is 21828463. The reversal of 21828453 is 35482812.

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

It is not a de Polignac number, because 21828453 - 2⁴ = 21828437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828413) 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, 51028 + ... + 51453.

It is an arithmetic number, because the mean of its divisors is an integer number (3689352).

Almost surely, 2^21828453 is an apocalyptic number.

It is an amenable number.

21828453 is a deficient number, since it is larger than the sum of its proper divisors (7686363).

21828453 is a wasteful number, since it uses less digits than its factorization.

21828453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102555.

The product of its digits is 15360, while the sum is 33.

The square root of 21828453 is about 4672.0929999305. The cubic root of 21828453 is about 279.4737265997.

The spelling of 21828453 in words is "twenty-one million, eight hundred twenty-eight thousand, four hundred fifty-three".