21944153 has 8 divisors (see below), whose sum is σ = 27359040. Its totient is φ = 17099280.

The previous prime is 21944149. The next prime is 21944171. The reversal of 21944153 is 35144912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21944153 - 2² = 21944149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21944113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142418 + ... + 142571.

It is an arithmetic number, because the mean of its divisors is an integer number (3419880).

Almost surely, 2^21944153 is an apocalyptic number.

It is an amenable number.

21944153 is a deficient number, since it is larger than the sum of its proper divisors (5414887).

21944153 is a wasteful number, since it uses less digits than its factorization.

21944153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285007.

The product of its digits is 4320, while the sum is 29.

The square root of 21944153 is about 4684.4586666978. The cubic root of 21944153 is about 279.9666329286.

The spelling of 21944153 in words is "twenty-one million, nine hundred forty-four thousand, one hundred fifty-three".