121220200020 has 24 divisors (see below), whose sum is σ = 339416560224. Its totient is φ = 32325386656.

The previous prime is 121220199953. The next prime is 121220200027. The reversal of 121220200020 is 20002022121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121220199969 and 121220200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220200027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010168274 + ... + 1010168393.

It is an arithmetic number, because the mean of its divisors is an integer number (14142356676).

Almost surely, 2^121220200020 is an apocalyptic number.

121220200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121220200020 is an abundant number, since it is smaller than the sum of its proper divisors (218196360204).

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

121220200020 is a wasteful number, since it uses less digits than its factorization.

121220200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020336679 (or 2020336677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 121220200020 its reverse (20002022121), we get a palindrome (141222222141).

The spelling of 121220200020 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred thousand, twenty".