21944333 has 2 divisors, whose sum is σ = 21944334. Its totient is φ = 21944332.

The previous prime is 21944303. The next prime is 21944357. The reversal of 21944333 is 33344912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21557449 + 386884 = 4643^2 + 622^2 .

It is a cyclic number.

It is not a de Polignac number, because 21944333 - 2⁶ = 21944269 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21944296 and 21944305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21944303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10972166 + 10972167.

It is an arithmetic number, because the mean of its divisors is an integer number (10972167).

Almost surely, 2^21944333 is an apocalyptic number.

It is an amenable number.

21944333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21944333 is an equidigital number, since it uses as much as digits as its factorization.

21944333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 21944333 is about 4684.4778791238. The cubic root of 21944333 is about 279.9673984151.

The spelling of 21944333 in words is "twenty-one million, nine hundred forty-four thousand, three hundred thirty-three".