121000122222020 has 72 divisors (see below), whose sum is σ = 260521974090504. Its totient is φ = 47206326784000.

The previous prime is 121000122222017. The next prime is 121000122222041. The reversal of 121000122222020 is 20222221000121.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 25912192521604 + 95087929700416 = 5090402^2 + 9751304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121000122222020.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119890700 + ... + 120895740.

It is an arithmetic number, because the mean of its divisors is an integer number (3618360751257).

Almost surely, 2^{121000122222020} is an apocalyptic number.

121000122222020 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 121000122222020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130260987045252).

121000122222020 is an abundant number, since it is smaller than the sum of its proper divisors (139521851868484).

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

121000122222020 is a wasteful number, since it uses less digits than its factorization.

121000122222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008713 (or 1008670 counting only the distinct ones).

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

Adding to 121000122222020 its reverse (20222221000121), we get a palindrome (141222343222141).

The spelling of 121000122222020 in words is "one hundred twenty-one trillion, one hundred twenty-two million, two hundred twenty-two thousand, twenty".