21233012 has 6 divisors (see below), whose sum is σ = 37157778. Its totient is φ = 10616504.

The previous prime is 21233011. The next prime is 21233027. The reversal of 21233012 is 21033212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 4553956 = 4084^2 + 2134^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654123 + ... + 2654130.

It is an arithmetic number, because the mean of its divisors is an integer number (6192963).

Almost surely, 2^21233012 is an apocalyptic number.

It is an amenable number.

21233012 is a deficient number, since it is larger than the sum of its proper divisors (15924766).

21233012 is a wasteful number, since it uses less digits than its factorization.

21233012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308257 (or 5308255 counting only the distinct ones).

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

The square root of 21233012 is about 4607.9292529291. The cubic root of 21233012 is about 276.9090831881.

Adding to 21233012 its reverse (21033212), we get a palindrome (42266224).

The spelling of 21233012 in words is "twenty-one million, two hundred thirty-three thousand, twelve".