121021002220 has 48 divisors (see below), whose sum is σ = 256045079808. Its totient is φ = 48047172800.

The previous prime is 121021002139. The next prime is 121021002229. The reversal of 121021002220 is 22200120121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121021002220.

It is not an unprimeable number, because it can be changed into a prime (121021002229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2254695 + ... + 2307745.

It is an arithmetic number, because the mean of its divisors is an integer number (5334272496).

Almost surely, 2^121021002220 is an apocalyptic number.

121021002220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021002220 is an abundant number, since it is smaller than the sum of its proper divisors (135024077588).

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

121021002220 is a wasteful number, since it uses less digits than its factorization.

121021002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53910 (or 53908 counting only the distinct ones).

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

Adding to 121021002220 its reverse (22200120121), we get a palindrome (143221122341).

The spelling of 121021002220 in words is "one hundred twenty-one billion, twenty-one million, two thousand, two hundred twenty".