121220111000000 has 196 divisors, whose sum is σ = 300984718596288. Its totient is φ = 48438720000000.

The previous prime is 121220110999997. The next prime is 121220111000141. The reversal of 121220111000000 is 111022121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 990938840 + ... + 991061160.

Almost surely, 2^{121220111000000} is an apocalyptic number.

121220111000000 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 121220111000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150492359298144).

121220111000000 is an abundant number, since it is smaller than the sum of its proper divisors (179764607596288).

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

121220111000000 is an frugal number, since it uses more digits than its factorization.

121220111000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123354 (or 123319 counting only the distinct ones).

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

Adding to 121220111000000 its reverse (111022121), we get a palindrome (121220222022121).

The spelling of 121220111000000 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million", and thus it is an aban number.