233421221 has 12 divisors (see below), whose sum is σ = 259828800. Its totient is φ = 209506440.

The previous prime is 233421151. The next prime is 233421239. The reversal of 233421221 is 122124332.

It is not a de Polignac number, because 233421221 - 2¹⁰ = 233420197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 233421193 and 233421202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233421121) 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 in 11 ways as a sum of consecutive naturals, for example, 2651 + ... + 21768.

It is an arithmetic number, because the mean of its divisors is an integer number (21652400).

Almost surely, 2^233421221 is an apocalyptic number.

It is an amenable number.

233421221 is a deficient number, since it is larger than the sum of its proper divisors (26407579).

233421221 is a wasteful number, since it uses less digits than its factorization.

233421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24520 (or 24509 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 233421221 is about 15278.1288448553. The cubic root of 233421221 is about 615.7155361741.

Adding to 233421221 its reverse (122124332), we get a palindrome (355545553).

It can be divided in two parts, 23342 and 1221, that multiplied together give a palindrome (28500582).

The spelling of 233421221 in words is "two hundred thirty-three million, four hundred twenty-one thousand, two hundred twenty-one".