121200000020 has 48 divisors (see below), whose sum is σ = 286614913536. Its totient is φ = 42651024000.

The previous prime is 121199999981. The next prime is 121200000023. The reversal of 121200000020 is 20000002121.

It is a junction number, because it is equal to n+sod(n) for n = 121199999953 and 121200000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200000023) 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, 8878811 + ... + 8892450.

It is an arithmetic number, because the mean of its divisors is an integer number (5971144032).

Almost surely, 2^121200000020 is an apocalyptic number.

121200000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200000020 is an abundant number, since it is smaller than the sum of its proper divisors (165414913516).

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

121200000020 is a wasteful number, since it uses less digits than its factorization.

121200000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17771312 (or 17771310 counting only the distinct ones).

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

Adding to 121200000020 its reverse (20000002121), we get a palindrome (141200002141).

The spelling of 121200000020 in words is "one hundred twenty-one billion, two hundred million, twenty", and thus it is an aban number.