121201022220 has 48 divisors (see below), whose sum is σ = 345765944160. Its totient is φ = 31710455296.

The previous prime is 121201022209. The next prime is 121201022231. The reversal of 121201022220 is 22220102121.

It is an interprime number because it is at equal distance from previous prime (121201022209) and next prime (121201022231).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121201022220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19053585 + ... + 19059944.

It is an arithmetic number, because the mean of its divisors is an integer number (7203457170).

Almost surely, 2^121201022220 is an apocalyptic number.

121201022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201022220 is an abundant number, since it is smaller than the sum of its proper divisors (224564921940).

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

121201022220 is a wasteful number, since it uses less digits than its factorization.

121201022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38113594 (or 38113592 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 121201022220 its reverse (22220102121), we get a palindrome (143421124341).

The spelling of 121201022220 in words is "one hundred twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty".