21233372 has 12 divisors (see below), whose sum is σ = 37713480. Its totient is φ = 10458096.

The previous prime is 21233371. The next prime is 21233389. The reversal of 21233372 is 27333212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233371) 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, 39347 + ... + 39882.

It is an arithmetic number, because the mean of its divisors is an integer number (3142790).

Almost surely, 2^21233372 is an apocalyptic number.

It is an amenable number.

21233372 is a deficient number, since it is larger than the sum of its proper divisors (16480108).

21233372 is a wasteful number, since it uses less digits than its factorization.

21233372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79300 (or 79298 counting only the distinct ones).

The product of its digits is 1512, while the sum is 23.

The square root of 21233372 is about 4607.9683158633. The cubic root of 21233372 is about 276.9106481522.

Adding to 21233372 its reverse (27333212), we get a palindrome (48566584).

The spelling of 21233372 in words is "twenty-one million, two hundred thirty-three thousand, three hundred seventy-two".