21233120 has 24 divisors (see below), whose sum is σ = 50163624. Its totient is φ = 8493184.

The previous prime is 21233111. The next prime is 21233123. The reversal of 21233120 is 2133212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21233095 and 21233104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66194 + ... + 66513.

It is an arithmetic number, because the mean of its divisors is an integer number (2090151).

Almost surely, 2^21233120 is an apocalyptic number.

21233120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233120 is an abundant number, since it is smaller than the sum of its proper divisors (28930504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21233120 is a wasteful number, since it uses less digits than its factorization.

21233120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132722 (or 132714 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21233120 is about 4607.9409718441. The cubic root of 21233120 is about 276.9095526792.

Adding to 21233120 its reverse (2133212), we get a palindrome (23366332).

The spelling of 21233120 in words is "twenty-one million, two hundred thirty-three thousand, one hundred twenty".