23021533 has 2 divisors, whose sum is σ = 23021534. Its totient is φ = 23021532.

The previous prime is 23021513. The next prime is 23021539. The reversal of 23021533 is 33512032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23020804 + 729 = 4798^2 + 27^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021533 - 2⁵ = 23021501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23021533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23021539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510766 + 11510767.

It is an arithmetic number, because the mean of its divisors is an integer number (11510767).

Almost surely, 2^23021533 is an apocalyptic number.

It is an amenable number.

23021533 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021533 is an equidigital number, since it uses as much as digits as its factorization.

23021533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 23021533 is about 4798.0759685524. The cubic root of 23021533 is about 284.4754195609.

Adding to 23021533 its reverse (33512032), we get a palindrome (56533565).

The spelling of 23021533 in words is "twenty-three million, twenty-one thousand, five hundred thirty-three".