212212221221 has 64 divisors (see below), whose sum is σ = 291940540416. Its totient is φ = 148904870400.

The previous prime is 212212221203. The next prime is 212212221223. The reversal of 212212221221 is 122122212212.

It is not a de Polignac number, because 212212221221 - 2¹⁰ = 212212220197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212212221193 and 212212221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14718506 + ... + 14732916.

It is an arithmetic number, because the mean of its divisors is an integer number (4561570944).

Almost surely, 2^212212221221 is an apocalyptic number.

It is an amenable number.

212212221221 is a deficient number, since it is larger than the sum of its proper divisors (79728319195).

212212221221 is a wasteful number, since it uses less digits than its factorization.

212212221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14802.

The product of its digits is 256, while the sum is 20.

Adding to 212212221221 its reverse (122122212212), we get a palindrome (334334433433).

Subtracting from 212212221221 its reverse (122122212212), we obtain a palindrome (90090009009).

It can be divided in two parts, 2 and 12212221221, that multiplied together give a palindrome (24424442442).

The spelling of 212212221221 in words is "two hundred twelve billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".