21944335 has 16 divisors (see below), whose sum is σ = 31680000. Its totient is φ = 14255136.

The previous prime is 21944333. The next prime is 21944357. The reversal of 21944335 is 53344912.

It is not a de Polignac number, because 21944335 - 2¹ = 21944333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21944297 and 21944306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944333) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 15835 + ... + 17164.

It is an arithmetic number, because the mean of its divisors is an integer number (1980000).

Almost surely, 2^21944335 is an apocalyptic number.

21944335 is a deficient number, since it is larger than the sum of its proper divisors (9735665).

21944335 is a wasteful number, since it uses less digits than its factorization.

21944335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33030.

The product of its digits is 12960, while the sum is 31.

The square root of 21944335 is about 4684.4780925947. The cubic root of 21944335 is about 279.9674069205.

The spelling of 21944335 in words is "twenty-one million, nine hundred forty-four thousand, three hundred thirty-five".