121001221220020 has 48 divisors (see below), whose sum is σ = 265169346720768. Its totient is φ = 46292829102080.

The previous prime is 121001221219999. The next prime is 121001221220021. The reversal of 121001221220020 is 20022122100121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121001221219976 and 121001221220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001221220021) 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, 2863204 + ... + 15817723.

It is an arithmetic number, because the mean of its divisors is an integer number (5524361390016).

Almost surely, 2^{121001221220020} is an apocalyptic number.

121001221220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121001221220020 is an abundant number, since it is smaller than the sum of its proper divisors (144168125500748).

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

121001221220020 is a wasteful number, since it uses less digits than its factorization.

121001221220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18695040 (or 18695038 counting only the distinct ones).

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

Adding to 121001221220020 its reverse (20022122100121), we get a palindrome (141023343320141).

The spelling of 121001221220020 in words is "one hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred twenty thousand, twenty".