21444933 has 4 divisors (see below), whose sum is σ = 28593248. Its totient is φ = 14296620.

The previous prime is 21444931. The next prime is 21444953. The reversal of 21444933 is 33944412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21444933 - 2¹ = 21444931 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21444933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3574153 + ... + 3574158.

It is an arithmetic number, because the mean of its divisors is an integer number (7148312).

Almost surely, 2^21444933 is an apocalyptic number.

It is an amenable number.

21444933 is a deficient number, since it is larger than the sum of its proper divisors (7148315).

21444933 is an equidigital number, since it uses as much as digits as its factorization.

21444933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7148314.

The product of its digits is 10368, while the sum is 30.

The square root of 21444933 is about 4630.8674133471. The cubic root of 21444933 is about 277.8272869205.

The spelling of 21444933 in words is "twenty-one million, four hundred forty-four thousand, nine hundred thirty-three".