21223935 has 24 divisors (see below), whose sum is σ = 37134240. Its totient is φ = 11212992.

The previous prime is 21223927. The next prime is 21223957. The reversal of 21223935 is 53932212.

It is not a de Polignac number, because 21223935 - 2³ = 21223927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223899 and 21223908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2742 + ... + 7068.

It is an arithmetic number, because the mean of its divisors is an integer number (1547260).

Almost surely, 2^21223935 is an apocalyptic number.

21223935 is a deficient number, since it is larger than the sum of its proper divisors (15910305).

21223935 is a wasteful number, since it uses less digits than its factorization.

21223935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447 (or 4444 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 21223935 is about 4606.9442149868. The cubic root of 21223935 is about 276.8696185092.

The spelling of 21223935 in words is "twenty-one million, two hundred twenty-three thousand, nine hundred thirty-five".