212321232221 has 8 divisors (see below), whose sum is σ = 242683258944. Its totient is φ = 181966811040.

The previous prime is 212321232191. The next prime is 212321232223. The reversal of 212321232221 is 122232123212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212321232221 - 2¹⁰ = 212321231197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212321232223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841435 + ... + 1953336.

It is an arithmetic number, because the mean of its divisors is an integer number (30335407368).

Almost surely, 2^212321232221 is an apocalyptic number.

It is an amenable number.

212321232221 is a deficient number, since it is larger than the sum of its proper divisors (30362026723).

212321232221 is an equidigital number, since it uses as much as digits as its factorization.

212321232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802771.

The product of its digits is 1152, while the sum is 23.

Adding to 212321232221 its reverse (122232123212), we get a palindrome (334553355433).

The spelling of 212321232221 in words is "two hundred twelve billion, three hundred twenty-one million, two hundred thirty-two thousand, two hundred twenty-one".