121002221121100 has 144 divisors (see below), whose sum is σ = 298962138698496. Its totient is φ = 42078894880000.

The previous prime is 121002221121071. The next prime is 121002221121107. The reversal of 121002221121100 is 1121122200121.

It is not an unprimeable number, because it can be changed into a prime (121002221121107) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120611550 + ... + 121610650.

It is an arithmetic number, because the mean of its divisors is an integer number (2076125963184).

Almost surely, 2^{121002221121100} is an apocalyptic number.

121002221121100 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 121002221121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149481069349248).

121002221121100 is an abundant number, since it is smaller than the sum of its proper divisors (177959917577396).

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

121002221121100 is a wasteful number, since it uses less digits than its factorization.

121002221121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003936 (or 1003929 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121002221121100 its reverse (1121122200121), we get a palindrome (122123343321221).

The spelling of 121002221121100 in words is "one hundred twenty-one trillion, two billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred".