121112021100 has 216 divisors, whose sum is σ = 429083578560. Its totient is φ = 26225700480.

The previous prime is 121112021071. The next prime is 121112021137. The reversal of 121112021100 is 1120211121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 62487 + ... + 496113.

Almost surely, 2^121112021100 is an apocalyptic number.

121112021100 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 121112021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214541789280).

121112021100 is an abundant number, since it is smaller than the sum of its proper divisors (307971557460).

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

121112021100 is a wasteful number, since it uses less digits than its factorization.

121112021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433677 (or 433663 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121112021100 its reverse (1120211121), we get a palindrome (122232232221).

The spelling of 121112021100 in words is "one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, one hundred".