233021421 has 16 divisors (see below), whose sum is σ = 349379520. Its totient is φ = 153474480.

The previous prime is 233021417. The next prime is 233021423. The reversal of 233021421 is 124120332.

It is not a de Polignac number, because 233021421 - 2² = 233021417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 233021394 and 233021403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233021423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49750 + ... + 54231.

It is an arithmetic number, because the mean of its divisors is an integer number (21836220).

Almost surely, 2^233021421 is an apocalyptic number.

It is an amenable number.

233021421 is a deficient number, since it is larger than the sum of its proper divisors (116358099).

233021421 is a wasteful number, since it uses less digits than its factorization.

233021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104073 (or 104067 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 233021421 is about 15265.0391745321. The cubic root of 233021421 is about 615.3638061621.

Adding to 233021421 its reverse (124120332), we get a palindrome (357141753).

The spelling of 233021421 in words is "two hundred thirty-three million, twenty-one thousand, four hundred twenty-one".