121002002020 has 12 divisors (see below), whose sum is σ = 254104204284. Its totient is φ = 48400800800.

The previous prime is 121002001937. The next prime is 121002002027. The reversal of 121002002020 is 20200200121.

It can be written as a sum of positive squares in 2 ways, for example, as 23478207076 + 97523794944 = 153226^2 + 312288^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121002001988 and 121002002006.

It is not an unprimeable number, because it can be changed into a prime (121002002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3025050031 + ... + 3025050070.

It is an arithmetic number, because the mean of its divisors is an integer number (21175350357).

Almost surely, 2^121002002020 is an apocalyptic number.

121002002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121002002020 is an abundant number, since it is smaller than the sum of its proper divisors (133102202264).

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

121002002020 is a wasteful number, since it uses less digits than its factorization.

121002002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050100110 (or 6050100108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 121002002020 its reverse (20200200121), we get a palindrome (141202202141).

The spelling of 121002002020 in words is "one hundred twenty-one billion, two million, two thousand, twenty".