121221102220 has 24 divisors (see below), whose sum is σ = 254578683744. Its totient is φ = 48485703936.

The previous prime is 121221102199. The next prime is 121221102251. The reversal of 121221102220 is 22201122121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121221102194 and 121221102203.

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 7 ways as a sum of consecutive naturals, for example, 213172 + ... + 536548.

It is an arithmetic number, because the mean of its divisors is an integer number (10607445156).

Almost surely, 2^121221102220 is an apocalyptic number.

121221102220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221102220 is an abundant number, since it is smaller than the sum of its proper divisors (133357581524).

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

121221102220 is a wasteful number, since it uses less digits than its factorization.

121221102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342129 (or 342127 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221102220 its reverse (22201122121), we get a palindrome (143422224341).

The spelling of 121221102220 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty".