233621 has 2 divisors, whose sum is σ = 233622. Its totient is φ = 233620.

The previous prime is 233617. The next prime is 233641. The reversal of 233621 is 126332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 96721 = 370^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 233621 - 2² = 233617 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 233621.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 233621.

It is not a weakly prime, because it can be changed into another prime (233641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116810 + 116811.

It is an arithmetic number, because the mean of its divisors is an integer number (116811).

2²³³⁶²¹ is an apocalyptic number.

It is an amenable number.

233621 is a deficient number, since it is larger than the sum of its proper divisors (1).

233621 is an equidigital number, since it uses as much as digits as its factorization.

233621 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 233621 is about 483.3435631101. The cubic root of 233621 is about 61.5891144255.

Adding to 233621 its reverse (126332), we get a palindrome (359953).

The spelling of 233621 in words is "two hundred thirty-three thousand, six hundred twenty-one".