21814554 has 16 divisors (see below), whose sum is σ = 45133920. Its totient is φ = 7020720.

The previous prime is 21814547. The next prime is 21814589. The reversal of 21814554 is 45541812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62512 + ... + 62859.

It is an arithmetic number, because the mean of its divisors is an integer number (2820870).

Almost surely, 2^21814554 is an apocalyptic number.

21814554 is an abundant number, since it is smaller than the sum of its proper divisors (23319366).

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

21814554 is a wasteful number, since it uses less digits than its factorization.

21814554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125405.

The product of its digits is 6400, while the sum is 30.

The square root of 21814554 is about 4670.6053140894. The cubic root of 21814554 is about 279.4143968484.

The spelling of 21814554 in words is "twenty-one million, eight hundred fourteen thousand, five hundred fifty-four".