121222212222222 has 160 divisors (see below), whose sum is σ = 279975152126208. Its totient is φ = 39173707482624.

The previous prime is 121222212222203. The next prime is 121222212222229. The reversal of 121222212222222 is 222222212222121.

121222212222222 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 2 + 2 + 212 + 222 + 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 (121222212222229) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2229674883 + ... + 2229729249.

Almost surely, 2^{121222212222222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121222212222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139987576063104).

121222212222222 is an abundant number, since it is smaller than the sum of its proper divisors (158752939903986).

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

121222212222222 is a wasteful number, since it uses less digits than its factorization.

121222212222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55752 (or 55743 counting only the distinct ones).

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

Adding to 121222212222222 its reverse (222222212222121), we get a palindrome (343444424444343).

The spelling of 121222212222222 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".