121200020 has 24 divisors (see below), whose sum is σ = 255028704. Its totient is φ = 48383136.

The previous prime is 121200017. The next prime is 121200047. The reversal of 121200020 is 20002121.

It is a junction number, because it is equal to n+sod(n) for n = 121199980 and 121200007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4667 + ... + 16253.

It is an arithmetic number, because the mean of its divisors is an integer number (10626196).

Almost surely, 2^121200020 is an apocalyptic number.

121200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200020 is an abundant number, since it is smaller than the sum of its proper divisors (133828684).

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

121200020 is a wasteful number, since it uses less digits than its factorization.

121200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12119 (or 12117 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 121200020 is about 11009.0880639588. The cubic root of 121200020 is about 494.8811332444.

Adding to 121200020 its reverse (20002121), we get a palindrome (141202141).

The spelling of 121200020 in words is "one hundred twenty-one million, two hundred thousand, twenty".