21112233 has 8 divisors (see below), whose sum is σ = 28197600. Its totient is φ = 14050848.

The previous prime is 21112207. The next prime is 21112241. The reversal of 21112233 is 33221112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21112233 - 2¹² = 21108137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3828 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (3524700).

Almost surely, 2^21112233 is an apocalyptic number.

It is an amenable number.

21112233 is a deficient number, since it is larger than the sum of its proper divisors (7085367).

21112233 is a wasteful number, since it uses less digits than its factorization.

21112233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11991.

The product of its digits is 72, while the sum is 15.

The square root of 21112233 is about 4594.8050013031. The cubic root of 21112233 is about 276.3830404138.

Adding to 21112233 its reverse (33221112), we get a palindrome (54333345).

The spelling of 21112233 in words is "twenty-one million, one hundred twelve thousand, two hundred thirty-three".