121212000020 has 24 divisors (see below), whose sum is σ = 255610252800. Its totient is φ = 48281932832.

The previous prime is 121212000001. The next prime is 121212000047. The reversal of 121212000020 is 20000212121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121211999965 and 121212000010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12674300 + ... + 12683859.

It is an arithmetic number, because the mean of its divisors is an integer number (10650427200).

Almost surely, 2^121212000020 is an apocalyptic number.

121212000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212000020 is an abundant number, since it is smaller than the sum of its proper divisors (134398252780).

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

121212000020 is a wasteful number, since it uses less digits than its factorization.

121212000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25358407 (or 25358405 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121212000020 its reverse (20000212121), we get a palindrome (141212212141).

The spelling of 121212000020 in words is "one hundred twenty-one billion, two hundred twelve million, twenty", and thus it is an aban number.