122222212221222 has 192 divisors, whose sum is σ = 298674278622720. Its totient is φ = 37303094509056.

The previous prime is 122222212221191. The next prime is 122222212221223. The reversal of 122222212221222 is 222122212222221.

122222212221222 is a `hidden beast` number, since 1 + 2 + 2 + 2 + 2 + 2 + 212 + 221 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122222212221223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2918439679 + ... + 2918481557.

It is an arithmetic number, because the mean of its divisors is an integer number (1555595201160).

Almost surely, 2^{122222212221222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122222212221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149337139311360).

122222212221222 is an abundant number, since it is smaller than the sum of its proper divisors (176452066401498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122222212221222 is a wasteful number, since it uses less digits than its factorization.

122222212221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51497 (or 51485 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

Adding to 122222212221222 its reverse (222122212222221), we get a palindrome (344344424443443).

Subtracting 122222212221222 from its reverse (222122212222221), we obtain a palindrome (99900000000999).

The spelling of 122222212221222 in words is "one hundred twenty-two trillion, two hundred twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".