121221021000220 has 12 divisors (see below), whose sum is σ = 254564144100504. Its totient is φ = 48488408400080.

The previous prime is 121221021000143. The next prime is 121221021000239. The reversal of 121221021000220 is 22000120122121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121221021000194 and 121221021000203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030525524986 + ... + 3030525525025.

It is an arithmetic number, because the mean of its divisors is an integer number (21213678675042).

Almost surely, 2^{121221021000220} is an apocalyptic number.

121221021000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021000220 is an abundant number, since it is smaller than the sum of its proper divisors (133343123100284).

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

121221021000220 is a wasteful number, since it uses less digits than its factorization.

121221021000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061051050020 (or 6061051050018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221021000220 its reverse (22000120122121), we get a palindrome (143221141122341).

The spelling of 121221021000220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty", and thus it is an aban number.