233565421 has 2 divisors, whose sum is σ = 233565422. Its totient is φ = 233565420.

The previous prime is 233565383. The next prime is 233565457. The reversal of 233565421 is 124565332.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227587396 + 5978025 = 15086^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 233565421 - 2¹¹ = 233563373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233565481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116782710 + 116782711.

It is an arithmetic number, because the mean of its divisors is an integer number (116782711).

Almost surely, 2^233565421 is an apocalyptic number.

It is an amenable number.

233565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

233565421 is an equidigital number, since it uses as much as digits as its factorization.

233565421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 31.

The square root of 233565421 is about 15282.8472805299. The cubic root of 233565421 is about 615.8422997179.

The spelling of 233565421 in words is "two hundred thirty-three million, five hundred sixty-five thousand, four hundred twenty-one".