21944074 has 4 divisors (see below), whose sum is σ = 32916114. Its totient is φ = 10972036.

The previous prime is 21944057. The next prime is 21944081. The reversal of 21944074 is 47044912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 3822025 = 4257^2 + 1955^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5486017 + ... + 5486020.

Almost surely, 2^21944074 is an apocalyptic number.

21944074 is a deficient number, since it is larger than the sum of its proper divisors (10972040).

21944074 is a wasteful number, since it uses less digits than its factorization.

21944074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10972039.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21944074 is about 4684.4502345526. The cubic root of 21944074 is about 279.9662969638.

Adding to 21944074 its reverse (47044912), we get a palindrome (68988986).

The spelling of 21944074 in words is "twenty-one million, nine hundred forty-four thousand, seventy-four".