21223395 has 24 divisors (see below), whose sum is σ = 38952576. Its totient is φ = 10652928.

The previous prime is 21223393. The next prime is 21223403. The reversal of 21223395 is 59332212.

It is not a de Polignac number, because 21223395 - 2¹ = 21223393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13107 + ... + 14636.

It is an arithmetic number, because the mean of its divisors is an integer number (1623024).

Almost surely, 2^21223395 is an apocalyptic number.

21223395 is a deficient number, since it is larger than the sum of its proper divisors (17729181).

21223395 is a wasteful number, since it uses less digits than its factorization.

21223395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27771 (or 27768 counting only the distinct ones).

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

The square root of 21223395 is about 4606.8856074359. The cubic root of 21223395 is about 276.8672703605.

The spelling of 21223395 in words is "twenty-one million, two hundred twenty-three thousand, three hundred ninety-five".