120121221100 has 144 divisors (see below), whose sum is σ = 274332441600. Its totient is φ = 45593568000.

The previous prime is 120121221071. The next prime is 120121221113. The reversal of 120121221100 is 1122121021.

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, 113214570 + ... + 113215630.

It is an arithmetic number, because the mean of its divisors is an integer number (1905086400).

Almost surely, 2^120121221100 is an apocalyptic number.

120121221100 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 120121221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137166220800).

120121221100 is an abundant number, since it is smaller than the sum of its proper divisors (154211220500).

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

120121221100 is a wasteful number, since it uses less digits than its factorization.

120121221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 120121221100 its reverse (1122121021), we get a palindrome (121243342121).

The spelling of 120121221100 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred".