21233023 has 12 divisors (see below), whose sum is σ = 24775392. Its totient is φ = 18144000.

The previous prime is 21233011. The next prime is 21233027. The reversal of 21233023 is 32033212.

It is not a de Polignac number, because 21233023 - 2⁹ = 21232511 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 21232988 and 21233006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27898 + ... + 28648.

It is an arithmetic number, because the mean of its divisors is an integer number (2064616).

Almost surely, 2^21233023 is an apocalyptic number.

21233023 is a deficient number, since it is larger than the sum of its proper divisors (3542369).

21233023 is an equidigital number, since it uses as much as digits as its factorization.

21233023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21233023 is about 4607.9304465237. The cubic root of 21233023 is about 276.9091310067.

Adding to 21233023 its reverse (32033212), we get a palindrome (53266235).

The spelling of 21233023 in words is "twenty-one million, two hundred thirty-three thousand, twenty-three".