21233356 has 12 divisors (see below), whose sum is σ = 37430568. Its totient is φ = 10538912.

The previous prime is 21233341. The next prime is 21233363. The reversal of 21233356 is 65333212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233356.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18826 + ... + 19921.

It is an arithmetic number, because the mean of its divisors is an integer number (3119214).

Almost surely, 2^21233356 is an apocalyptic number.

It is an amenable number.

21233356 is a deficient number, since it is larger than the sum of its proper divisors (16197212).

21233356 is a wasteful number, since it uses less digits than its factorization.

21233356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38888 (or 38886 counting only the distinct ones).

The product of its digits is 3240, while the sum is 25.

The square root of 21233356 is about 4607.9665797399. The cubic root of 21233356 is about 276.9105785986.

Adding to 21233356 its reverse (65333212), we get a palindrome (86566568).

The spelling of 21233356 in words is "twenty-one million, two hundred thirty-three thousand, three hundred fifty-six".