21944337 has 4 divisors (see below), whose sum is σ = 29259120. Its totient is φ = 14629556.

The previous prime is 21944333. The next prime is 21944357. The reversal of 21944337 is 73344912.

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 a cyclic number.

It is not a de Polignac number, because 21944337 - 2² = 21944333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21944298 and 21944307.

It is not an unprimeable number, because it can be changed into a prime (21944333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3657387 + ... + 3657392.

It is an arithmetic number, because the mean of its divisors is an integer number (7314780).

Almost surely, 2^21944337 is an apocalyptic number.

It is an amenable number.

21944337 is a deficient number, since it is larger than the sum of its proper divisors (7314783).

21944337 is an equidigital number, since it uses as much as digits as its factorization.

21944337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314782.

The product of its digits is 18144, while the sum is 33.

The square root of 21944337 is about 4684.4783060657. The cubic root of 21944337 is about 279.9674154259.

The spelling of 21944337 in words is "twenty-one million, nine hundred forty-four thousand, three hundred thirty-seven".