233921 has 2 divisors, whose sum is σ = 233922. Its totient is φ = 233920.

The previous prime is 233917. The next prime is 233923. The reversal of 233921 is 129332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 26896 = 455^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 233921 - 2² = 233917 is a prime.

Together with 233923, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 233893 and 233902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 233921.

It is not a weakly prime, because it can be changed into another prime (233923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116960 + 116961.

It is an arithmetic number, because the mean of its divisors is an integer number (116961).

2²³³⁹²¹ is an apocalyptic number.

It is an amenable number.

233921 is a deficient number, since it is larger than the sum of its proper divisors (1).

233921 is an equidigital number, since it uses as much as digits as its factorization.

233921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 233921 is about 483.6538018046. The cubic root of 233921 is about 61.6154659822.

The spelling of 233921 in words is "two hundred thirty-three thousand, nine hundred twenty-one".