21244434 has 16 divisors (see below), whose sum is σ = 42547680. Its totient is φ = 7071680.

The previous prime is 21244417. The next prime is 21244459. The reversal of 21244434 is 43444212.

It is a happy 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, 3277 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (2659230).

Almost surely, 2^21244434 is an apocalyptic number.

21244434 is an abundant number, since it is smaller than the sum of its proper divisors (21303246).

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

21244434 is a wasteful number, since it uses less digits than its factorization.

21244434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905.

The product of its digits is 3072, while the sum is 24.

The square root of 21244434 is about 4609.1684716443. The cubic root of 21244434 is about 276.9587274022.

Adding to 21244434 its reverse (43444212), we get a palindrome (64688646).

The spelling of 21244434 in words is "twenty-one million, two hundred forty-four thousand, four hundred thirty-four".