21399334 has 12 divisors (see below), whose sum is σ = 35282772. Its totient is φ = 9726860.

The previous prime is 21399319. The next prime is 21399353. The reversal of 21399334 is 43399312.

It is a self number, because there is not a number n which added to its sum of digits gives 21399334.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43972 + ... + 44455.

It is an arithmetic number, because the mean of its divisors is an integer number (2940231).

Almost surely, 2^21399334 is an apocalyptic number.

21399334 is a deficient number, since it is larger than the sum of its proper divisors (13883438).

21399334 is a wasteful number, since it uses less digits than its factorization.

21399334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88451 (or 88440 counting only the distinct ones).

The product of its digits is 17496, while the sum is 34.

The square root of 21399334 is about 4625.9414177008. The cubic root of 21399334 is about 277.6302297055.

The spelling of 21399334 in words is "twenty-one million, three hundred ninety-nine thousand, three hundred thirty-four".