21233123 has 2 divisors, whose sum is σ = 21233124. Its totient is φ = 21233122.

The previous prime is 21233111. The next prime is 21233131. The reversal of 21233123 is 32133212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21233123 - 2⁶ = 21233059 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21233183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616561 + 10616562.

It is an arithmetic number, because the mean of its divisors is an integer number (10616562).

Almost surely, 2^21233123 is an apocalyptic number.

21233123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233123 is an equidigital number, since it uses as much as digits as its factorization.

21233123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 17.

The square root of 21233123 is about 4607.9412973691. The cubic root of 21233123 is about 276.9095657206.

Adding to 21233123 its reverse (32133212), we get a palindrome (53366335).

The spelling of 21233123 in words is "twenty-one million, two hundred thirty-three thousand, one hundred twenty-three".