121221112122 has 48 divisors (see below), whose sum is σ = 288420200640. Its totient is φ = 36490392000.

The previous prime is 121221112099. The next prime is 121221112123. The reversal of 121221112122 is 221211122121.

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

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

It is a junction number, because it is equal to n+sod(n) for n = 121221112095 and 121221112104.

It is not an unprimeable number, because it can be changed into a prime (121221112123) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1997347 + ... + 2057142.

It is an arithmetic number, because the mean of its divisors is an integer number (6008754180).

Almost surely, 2^121221112122 is an apocalyptic number.

121221112122 is an abundant number, since it is smaller than the sum of its proper divisors (167199088518).

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

121221112122 is a wasteful number, since it uses less digits than its factorization.

121221112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054659 (or 4054656 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121221112122 its reverse (221211122121), we get a palindrome (342432234243).

Subtracting 121221112122 from its reverse (221211122121), we obtain a palindrome (99990009999).

The spelling of 121221112122 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-two".