212222011221 has 48 divisors (see below), whose sum is σ = 343798960128. Its totient is φ = 125015529600.

The previous prime is 212222011213. The next prime is 212222011231. The reversal of 212222011221 is 122110222212.

It is a happy number.

212222011221 is a `hidden beast` number, since 21 + 222 + 201 + 1 + 221 = 666.

It is not a de Polignac number, because 212222011221 - 2³ = 212222011213 is a prime.

It is a super-3 number, since 3×212222011221³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212222011194 and 212222011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222011231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3622956 + ... + 3681066.

It is an arithmetic number, because the mean of its divisors is an integer number (7162478336).

Almost surely, 2^212222011221 is an apocalyptic number.

It is an amenable number.

212222011221 is a deficient number, since it is larger than the sum of its proper divisors (131576948907).

212222011221 is a wasteful number, since it uses less digits than its factorization.

212222011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59162 (or 59159 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212222011221 its reverse (122110222212), we get a palindrome (334332233433).

The spelling of 212222011221 in words is "two hundred twelve billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".