121112211100 has 72 divisors (see below), whose sum is σ = 278343712640. Its totient is φ = 45613471680.

The previous prime is 121112211097. The next prime is 121112211109. The reversal of 121112211100 is 1112211121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112211109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114169 + ... + 505231.

Almost surely, 2^121112211100 is an apocalyptic number.

121112211100 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 121112211100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139171856320).

121112211100 is an abundant number, since it is smaller than the sum of its proper divisors (157231501540).

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

121112211100 is a wasteful number, since it uses less digits than its factorization.

121112211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391259 (or 391252 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121112211100 its reverse (1112211121), we get a palindrome (122224422221).

The spelling of 121112211100 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred eleven thousand, one hundred".