21229233 has 8 divisors (see below), whose sum is σ = 28338528. Its totient is φ = 14136384.

The previous prime is 21229199. The next prime is 21229237. The reversal of 21229233 is 33292212.

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

It is not a de Polignac number, because 21229233 - 2¹⁰ = 21228209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21229237) 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, 691 + ... + 6552.

It is an arithmetic number, because the mean of its divisors is an integer number (3542316).

Almost surely, 2^21229233 is an apocalyptic number.

It is an amenable number.

21229233 is a deficient number, since it is larger than the sum of its proper divisors (7109295).

21229233 is an equidigital number, since it uses as much as digits as its factorization.

21229233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8223.

The product of its digits is 1296, while the sum is 24.

The square root of 21229233 is about 4607.5191806437. The cubic root of 21229233 is about 276.8926543443.

The spelling of 21229233 in words is "twenty-one million, two hundred twenty-nine thousand, two hundred thirty-three".