21454458 has 16 divisors (see below), whose sum is σ = 45167520. Its totient is φ = 6775056.

The previous prime is 21454441. The next prime is 21454483. The reversal of 21454458 is 85445412.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93985 + ... + 94212.

It is an arithmetic number, because the mean of its divisors is an integer number (2822970).

Almost surely, 2^21454458 is an apocalyptic number.

21454458 is an abundant number, since it is smaller than the sum of its proper divisors (23713062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454458 is a wasteful number, since it uses less digits than its factorization.

21454458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188221.

The product of its digits is 25600, while the sum is 33.

The square root of 21454458 is about 4631.8957242149. The cubic root of 21454458 is about 277.8684141681.

It can be divided in two parts, 21454 and 458, that added together give a palindrome (21912).

The spelling of 21454458 in words is "twenty-one million, four hundred fifty-four thousand, four hundred fifty-eight".