21828454 has 8 divisors (see below), whose sum is σ = 34466040. Its totient is φ = 10339776.

The previous prime is 21828437. The next prime is 21828463. The reversal of 21828454 is 45482812.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287179 + ... + 287254.

It is an arithmetic number, because the mean of its divisors is an integer number (4308255).

Almost surely, 2^21828454 is an apocalyptic number.

21828454 is a deficient number, since it is larger than the sum of its proper divisors (12637586).

21828454 is a wasteful number, since it uses less digits than its factorization.

21828454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574454.

The product of its digits is 20480, while the sum is 34.

The square root of 21828454 is about 4672.0931069490. The cubic root of 21828454 is about 279.4737308675.

The spelling of 21828454 in words is "twenty-one million, eight hundred twenty-eight thousand, four hundred fifty-four".