121222102100 has 144 divisors (see below), whose sum is σ = 293713076160. Its totient is φ = 43054003200.

The previous prime is 121222102097. The next prime is 121222102109. The reversal of 121222102100 is 1201222121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222102109) 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 47 ways as a sum of consecutive naturals, for example, 10183352 + ... + 10195248.

It is an arithmetic number, because the mean of its divisors is an integer number (2039674140).

Almost surely, 2^121222102100 is an apocalyptic number.

121222102100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121222102100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146856538080).

121222102100 is an abundant number, since it is smaller than the sum of its proper divisors (172490974060).

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

121222102100 is a wasteful number, since it uses less digits than its factorization.

121222102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12138 (or 12131 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121222102100 its reverse (1201222121), we get a palindrome (122423324221).

It can be divided in two parts, 121222 and 102100, that added together give a palindrome (223322).

The spelling of 121222102100 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, one hundred".