233520421 has 2 divisors, whose sum is σ = 233520422. Its totient is φ = 233520420.

The previous prime is 233520377. The next prime is 233520433. The reversal of 233520421 is 124025332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204089796 + 29430625 = 14286^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 233520421 - 2⁷ = 233520293 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 233520392 and 233520401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (233520481) 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, 116760210 + 116760211.

It is an arithmetic number, because the mean of its divisors is an integer number (116760211).

Almost surely, 2^233520421 is an apocalyptic number.

It is an amenable number.

233520421 is a deficient number, since it is larger than the sum of its proper divisors (1).

233520421 is an equidigital number, since it uses as much as digits as its factorization.

233520421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 233520421 is about 15281.3749708591. The cubic root of 233520421 is about 615.8027466549.

Adding to 233520421 its reverse (124025332), we get a palindrome (357545753).

The spelling of 233520421 in words is "two hundred thirty-three million, five hundred twenty thousand, four hundred twenty-one".