21944241 has 12 divisors (see below), whose sum is σ = 34578960. Its totient is φ = 13299480.

The previous prime is 21944239. The next prime is 21944243. The reversal of 21944241 is 14244912.

It is a happy number.

21944241 is a `hidden beast` number, since 219 + 442 + 4 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21944239) and next prime (21944243).

It is not a de Polignac number, because 21944241 - 2¹ = 21944239 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21944243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110731 + ... + 110928.

It is an arithmetic number, because the mean of its divisors is an integer number (2881580).

Almost surely, 2^21944241 is an apocalyptic number.

It is an amenable number.

21944241 is a deficient number, since it is larger than the sum of its proper divisors (12634719).

21944241 is a wasteful number, since it uses less digits than its factorization.

21944241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221676 (or 221673 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21944241 is about 4684.4680594492. The cubic root of 21944241 is about 279.9670071670.

The spelling of 21944241 in words is "twenty-one million, nine hundred forty-four thousand, two hundred forty-one".