234402212221 has 4 divisors (see below), whose sum is σ = 234721997692. Its totient is φ = 234082426752.

The previous prime is 234402212159. The next prime is 234402212273. The reversal of 234402212221 is 122212204432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203947076025 + 30455136196 = 451605^2 + 174514^2 .

It is a cyclic number.

It is not a de Polignac number, because 234402212221 - 2¹¹ = 234402210173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (234402252221) 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, 159891636 + ... + 159893101.

It is an arithmetic number, because the mean of its divisors is an integer number (58680499423).

Almost surely, 2^234402212221 is an apocalyptic number.

It is an amenable number.

234402212221 is a deficient number, since it is larger than the sum of its proper divisors (319785471).

234402212221 is an equidigital number, since it uses as much as digits as its factorization.

234402212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319785470.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 234402212221 its reverse (122212204432), we get a palindrome (356614416653).

The spelling of 234402212221 in words is "two hundred thirty-four billion, four hundred two million, two hundred twelve thousand, two hundred twenty-one".