21233001 has 4 divisors (see below), whose sum is σ = 28310672. Its totient is φ = 14155332.

The previous prime is 21232993. The next prime is 21233011. The reversal of 21233001 is 10033212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21233001 - 2³ = 21232993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233011) 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, 3538831 + ... + 3538836.

It is an arithmetic number, because the mean of its divisors is an integer number (7077668).

Almost surely, 2^21233001 is an apocalyptic number.

It is an amenable number.

21233001 is a deficient number, since it is larger than the sum of its proper divisors (7077671).

21233001 is an equidigital number, since it uses as much as digits as its factorization.

21233001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077670.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21233001 is about 4607.9280593343. The cubic root of 21233001 is about 276.9090353695.

Adding to 21233001 its reverse (10033212), we get a palindrome (31266213).

The spelling of 21233001 in words is "twenty-one million, two hundred thirty-three thousand, one".