121102020000020 has 48 divisors (see below), whose sum is σ = 255948321811728. Its totient is φ = 48129589048320.

The previous prime is 121102019999963. The next prime is 121102020000103. The reversal of 121102020000020 is 20000020201121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 22473326284816 + 98628693715204 = 4740604^2 + 9931198^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121102019999956 and 121102020000010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55835774 + ... + 57964106.

It is an arithmetic number, because the mean of its divisors is an integer number (5332256704411).

Almost surely, 2^{121102020000020} is an apocalyptic number.

121102020000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121102020000020 is an abundant number, since it is smaller than the sum of its proper divisors (134846301811708).

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

121102020000020 is a wasteful number, since it uses less digits than its factorization.

121102020000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146620 (or 2146618 counting only the distinct ones).

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

Adding to 121102020000020 its reverse (20000020201121), we get a palindrome (141102040201141).

The spelling of 121102020000020 in words is "one hundred twenty-one trillion, one hundred two billion, twenty million, twenty", and thus it is an aban number.