21672233 has 8 divisors (see below), whose sum is σ = 24670656. Its totient is φ = 18845200.

The previous prime is 21672227. The next prime is 21672239. The reversal of 21672233 is 33227612.

It is an interprime number because it is at equal distance from previous prime (21672227) and next prime (21672239).

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

It is not a de Polignac number, because 21672233 - 2⁸ = 21671977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21672239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42578 + ... + 43083.

It is an arithmetic number, because the mean of its divisors is an integer number (3083832).

Almost surely, 2^21672233 is an apocalyptic number.

21672233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21672233 is a deficient number, since it is larger than the sum of its proper divisors (2998423).

21672233 is a wasteful number, since it uses less digits than its factorization.

21672233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85695.

The product of its digits is 3024, while the sum is 26.

The square root of 21672233 is about 4655.3445629728. The cubic root of 21672233 is about 278.8054252433.

Adding to 21672233 its reverse (33227612), we get a palindrome (54899845).

The spelling of 21672233 in words is "twenty-one million, six hundred seventy-two thousand, two hundred thirty-three".