21301233 has 8 divisors (see below), whose sum is σ = 29169408. Its totient is φ = 13816944.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301233 is 33210312.

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

It is not a de Polignac number, because 21301233 - 2² = 21301229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21301253) 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, 95841 + ... + 96062.

It is an arithmetic number, because the mean of its divisors is an integer number (3646176).

Almost surely, 2^21301233 is an apocalyptic number.

It is an amenable number.

21301233 is a deficient number, since it is larger than the sum of its proper divisors (7868175).

21301233 is a wasteful number, since it uses less digits than its factorization.

21301233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191943.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21301233 is about 4615.3258823186. The cubic root of 21301233 is about 277.2053328601.

Adding to 21301233 its reverse (33210312), we get a palindrome (54511545).

The spelling of 21301233 in words is "twenty-one million, three hundred one thousand, two hundred thirty-three".