21944445 has 32 divisors (see below), whose sum is σ = 36961920. Its totient is φ = 11101440.

The previous prime is 21944437. The next prime is 21944473. The reversal of 21944445 is 54444912.

It is not a de Polignac number, because 21944445 - 2³ = 21944437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26122 + ... + 26948.

It is an arithmetic number, because the mean of its divisors is an integer number (1155060).

Almost surely, 2^21944445 is an apocalyptic number.

It is an amenable number.

21944445 is a deficient number, since it is larger than the sum of its proper divisors (15017475).

21944445 is a wasteful number, since it uses less digits than its factorization.

21944445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925.

The product of its digits is 23040, while the sum is 33.

The square root of 21944445 is about 4684.4898334824. The cubic root of 21944445 is about 279.9678747157.

The spelling of 21944445 in words is "twenty-one million, nine hundred forty-four thousand, four hundred forty-five".