21233191 has 8 divisors (see below), whose sum is σ = 25103520. Its totient is φ = 17572128.

The previous prime is 21233183. The next prime is 21233197. The reversal of 21233191 is 19133212.

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

It is not a de Polignac number, because 21233191 - 2³ = 21233183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52096 + ... + 52501.

It is an arithmetic number, because the mean of its divisors is an integer number (3137940).

Almost surely, 2^21233191 is an apocalyptic number.

21233191 is a deficient number, since it is larger than the sum of its proper divisors (3870329).

21233191 is a wasteful number, since it uses less digits than its factorization.

21233191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104633.

The product of its digits is 324, while the sum is 22.

The square root of 21233191 is about 4607.9486759295. The cubic root of 21233191 is about 276.9098613252.

The spelling of 21233191 in words is "twenty-one million, two hundred thirty-three thousand, one hundred ninety-one".