121220112222 has 32 divisors (see below), whose sum is σ = 293866940160. Its totient is φ = 36733367160.

The previous prime is 121220112197. The next prime is 121220112239. The reversal of 121220112222 is 222211022121.

It is a happy number.

It is a super-2 number, since 2×121220112222² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121220112195 and 121220112204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102036538 + ... + 102037725.

It is an arithmetic number, because the mean of its divisors is an integer number (9183341880).

Almost surely, 2^121220112222 is an apocalyptic number.

121220112222 is an abundant number, since it is smaller than the sum of its proper divisors (172646827938).

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

121220112222 is a wasteful number, since it uses less digits than its factorization.

121220112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204074285 (or 204074279 counting only the distinct ones).

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

Adding to 121220112222 its reverse (222211022121), we get a palindrome (343431134343).

The spelling of 121220112222 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty-two".