121221220002220 has 96 divisors (see below), whose sum is σ = 275328921067200. Its totient is φ = 44565774511104.

The previous prime is 121221220002191. The next prime is 121221220002271. The reversal of 121221220002220 is 22200022122121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102327651 + ... + 103505509.

It is an arithmetic number, because the mean of its divisors is an integer number (2868009594450).

Almost surely, 2^{121221220002220} is an apocalyptic number.

121221220002220 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 121221220002220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137664460533600).

121221220002220 is an abundant number, since it is smaller than the sum of its proper divisors (154107701064980).

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

121221220002220 is a wasteful number, since it uses less digits than its factorization.

121221220002220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179587 (or 1179585 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 121221220002220 its reverse (22200022122121), we get a palindrome (143421242124341).

The spelling of 121221220002220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two thousand, two hundred twenty".