212222221221 has 8 divisors (see below), whose sum is σ = 282970154304. Its totient is φ = 141477884480.

The previous prime is 212222221219. The next prime is 212222221301. The reversal of 212222221221 is 122122222212.

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

It is a cyclic number.

It is not a de Polignac number, because 212222221221 - 2¹ = 212222221219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222221021) 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, 758241 + ... + 999686.

It is an arithmetic number, because the mean of its divisors is an integer number (35371269288).

Almost surely, 2^212222221221 is an apocalyptic number.

It is an amenable number.

212222221221 is a deficient number, since it is larger than the sum of its proper divisors (70747933083).

212222221221 is a wasteful number, since it uses less digits than its factorization.

212222221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798171.

The product of its digits is 512, while the sum is 21.

Adding to 212222221221 its reverse (122122222212), we get a palindrome (334344443433).

Subtracting from 212222221221 its reverse (122122222212), we obtain a palindrome (90099999009).

The spelling of 212222221221 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".