21244450 has 12 divisors (see below), whose sum is σ = 39514770. Its totient is φ = 8497760.

The previous prime is 21244417. The next prime is 21244459. The reversal of 21244450 is 5444212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 16168441 + 5076009 = 4021^2 + 2253^2 .

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 5 ways as a sum of consecutive naturals, for example, 212395 + ... + 212494.

Almost surely, 2^21244450 is an apocalyptic number.

21244450 is a deficient number, since it is larger than the sum of its proper divisors (18270320).

21244450 is a wasteful number, since it uses less digits than its factorization.

21244450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424901 (or 424896 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 21244450 is about 4609.1702073150. The cubic root of 21244450 is about 276.9587969316.

Adding to 21244450 its reverse (5444212), we get a palindrome (26688662).

The spelling of 21244450 in words is "twenty-one million, two hundred forty-four thousand, four hundred fifty".