121221220122 has 24 divisors (see below), whose sum is σ = 263574065664. Its totient is φ = 40264290504.

The previous prime is 121221220111. The next prime is 121221220147. The reversal of 121221220122 is 221022122121.

It is a happy number.

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 = 121221220095 and 121221220104.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 11893338 + ... + 11903525.

It is an arithmetic number, because the mean of its divisors is an integer number (10982252736).

Almost surely, 2^121221220122 is an apocalyptic number.

121221220122 is an abundant number, since it is smaller than the sum of its proper divisors (142352845542).

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

121221220122 is a wasteful number, since it uses less digits than its factorization.

121221220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23797154 (or 23797151 counting only the distinct ones).

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

Adding to 121221220122 its reverse (221022122121), we get a palindrome (342243342243).

The spelling of 121221220122 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".