21244458 has 16 divisors (see below), whose sum is σ = 44988480. Its totient is φ = 6664896.

The previous prime is 21244417. The next prime is 21244459. The reversal of 21244458 is 85444212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21244459) 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, 104038 + ... + 104241.

It is an arithmetic number, because the mean of its divisors is an integer number (2811780).

Almost surely, 2^21244458 is an apocalyptic number.

21244458 is an abundant number, since it is smaller than the sum of its proper divisors (23744022).

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

21244458 is a wasteful number, since it uses less digits than its factorization.

21244458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208301.

The product of its digits is 10240, while the sum is 30.

The square root of 21244458 is about 4609.1710751501. The cubic root of 21244458 is about 276.9588316963.

The spelling of 21244458 in words is "twenty-one million, two hundred forty-four thousand, four hundred fifty-eight".