121221020200 has 96 divisors (see below), whose sum is σ = 323138424960. Its totient is φ = 41427705600.

The previous prime is 121221020189. The next prime is 121221020203. The reversal of 121221020200 is 2020122121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121221020203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296194 + ... + 574606.

It is an arithmetic number, because the mean of its divisors is an integer number (3366025260).

Almost surely, 2^121221020200 is an apocalyptic number.

121221020200 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 121221020200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161569212480).

121221020200 is an abundant number, since it is smaller than the sum of its proper divisors (201917404760).

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

121221020200 is a wasteful number, since it uses less digits than its factorization.

121221020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278747 (or 278738 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121221020200 its reverse (2020122121), we get a palindrome (123241142321).

The spelling of 121221020200 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, two hundred".