21944268 has 36 divisors (see below), whose sum is σ = 55648320. Its totient is φ = 7291296.

The previous prime is 21944243. The next prime is 21944269. The reversal of 21944268 is 86244912.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21944269) 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, 13221 + ... + 14787.

Almost surely, 2^21944268 is an apocalyptic number.

It is an amenable number.

21944268 is an abundant number, since it is smaller than the sum of its proper divisors (33704052).

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

21944268 is a wasteful number, since it uses less digits than its factorization.

21944268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1961 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21944268 is about 4684.4709413124. The cubic root of 21944268 is about 279.9671219899.

The spelling of 21944268 in words is "twenty-one million, nine hundred forty-four thousand, two hundred sixty-eight".