212323232221 has 4 divisors (see below), whose sum is σ = 223498139200. Its totient is φ = 201148325244.

The previous prime is 212323232207. The next prime is 212323232237. The reversal of 212323232221 is 122232323212.

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 not a de Polignac number, because 212323232221 - 2¹⁵ = 212323199453 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 (212323232621) 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, 5587453461 + ... + 5587453498.

It is an arithmetic number, because the mean of its divisors is an integer number (55874534800).

Almost surely, 2^212323232221 is an apocalyptic number.

It is an amenable number.

212323232221 is a deficient number, since it is larger than the sum of its proper divisors (11174906979).

212323232221 is a wasteful number, since it uses less digits than its factorization.

212323232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11174906978.

The product of its digits is 3456, while the sum is 25.

Adding to 212323232221 its reverse (122232323212), we get a palindrome (334555555433).

Subtracting from 212323232221 its reverse (122232323212), we obtain a palindrome (90090909009).

The spelling of 212323232221 in words is "two hundred twelve billion, three hundred twenty-three million, two hundred thirty-two thousand, two hundred twenty-one".