121221010220 has 24 divisors (see below), whose sum is σ = 269538482304. Its totient is φ = 45636144896.

The previous prime is 121221010201. The next prime is 121221010231. The reversal of 121221010220 is 22010122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221010195 and 121221010204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178265852 + ... + 178266531.

It is an arithmetic number, because the mean of its divisors is an integer number (11230770096).

Almost surely, 2^121221010220 is an apocalyptic number.

121221010220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221010220 is an abundant number, since it is smaller than the sum of its proper divisors (148317472084).

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

121221010220 is a wasteful number, since it uses less digits than its factorization.

121221010220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356532409 (or 356532407 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121221010220 its reverse (22010122121), we get a palindrome (143231132341).

The spelling of 121221010220 in words is "one hundred twenty-one billion, two hundred twenty-one million, ten thousand, two hundred twenty".