234021221 has 4 divisors (see below), whose sum is σ = 267452832. Its totient is φ = 200589612.

The previous prime is 234021209. The next prime is 234021223. The reversal of 234021221 is 122120432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-234021221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 234021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234021223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16715795 + ... + 16715808.

It is an arithmetic number, because the mean of its divisors is an integer number (66863208).

Almost surely, 2^234021221 is an apocalyptic number.

It is an amenable number.

234021221 is a deficient number, since it is larger than the sum of its proper divisors (33431611).

234021221 is an equidigital number, since it uses as much as digits as its factorization.

234021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33431610.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 234021221 is about 15297.7521551370. The cubic root of 234021221 is about 616.2426422600.

Adding to 234021221 its reverse (122120432), we get a palindrome (356141653).

The spelling of 234021221 in words is "two hundred thirty-four million, twenty-one thousand, two hundred twenty-one".