21233115 has 12 divisors (see below), whose sum is σ = 36804144. Its totient is φ = 11324304.

The previous prime is 21233111. The next prime is 21233123. The reversal of 21233115 is 51133212.

It is not a de Polignac number, because 21233115 - 2² = 21233111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233111) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 235879 + ... + 235968.

It is an arithmetic number, because the mean of its divisors is an integer number (3067012).

Almost surely, 2^21233115 is an apocalyptic number.

21233115 is a deficient number, since it is larger than the sum of its proper divisors (15571029).

21233115 is a wasteful number, since it uses less digits than its factorization.

21233115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471858 (or 471855 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 21233115 is about 4607.9404293024. The cubic root of 21233115 is about 276.9095309435.

Adding to 21233115 its reverse (51133212), we get a palindrome (72366327).

The spelling of 21233115 in words is "twenty-one million, two hundred thirty-three thousand, one hundred fifteen".