121222222100 has 108 divisors (see below), whose sum is σ = 309687303744. Its totient is φ = 41061021120.

The previous prime is 121222222073. The next prime is 121222222103. The reversal of 121222222100 is 1222222121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222222103) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 257669 + ... + 555731.

Almost surely, 2^121222222100 is an apocalyptic number.

121222222100 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 121222222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154843651872).

121222222100 is an abundant number, since it is smaller than the sum of its proper divisors (188465081644).

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

121222222100 is a wasteful number, since it uses less digits than its factorization.

121222222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298174 (or 298160 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121222222100 its reverse (1222222121), we get a palindrome (122444444221).

The spelling of 121222222100 in words is "one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred".