121202221220 has 12 divisors (see below), whose sum is σ = 254524664604. Its totient is φ = 48480888480.

The previous prime is 121202221213. The next prime is 121202221229. The reversal of 121202221220 is 22122202121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64413424804 + 56788796416 = 253798^2 + 238304^2 .

It is not an unprimeable number, because it can be changed into a prime (121202221229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030055511 + ... + 3030055550.

It is an arithmetic number, because the mean of its divisors is an integer number (21210388717).

Almost surely, 2^121202221220 is an apocalyptic number.

121202221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121202221220 is an abundant number, since it is smaller than the sum of its proper divisors (133322443384).

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

121202221220 is a wasteful number, since it uses less digits than its factorization.

121202221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060111070 (or 6060111068 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 121202221220 its reverse (22122202121), we get a palindrome (143324423341).

The spelling of 121202221220 in words is "one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred twenty".