121221100100000 has 288 divisors, whose sum is σ = 315133313927040. Its totient is φ = 45770382720000.

The previous prime is 121221100099999. The next prime is 121221100100011. The reversal of 121221100100000 is 1001122121.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 526184837 + ... + 526415163.

It is an arithmetic number, because the mean of its divisors is an integer number (1094212895580).

Almost surely, 2^{121221100100000} is an apocalyptic number.

121221100100000 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 121221100100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157566656963520).

121221100100000 is an abundant number, since it is smaller than the sum of its proper divisors (193912213827040).

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

121221100100000 is an equidigital number, since it uses as much as digits as its factorization.

121221100100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230658 (or 230630 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121221100100000 its reverse (1001122121), we get a palindrome (121222101222121).

The spelling of 121221100100000 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred thousand".