120121020020 has 48 divisors (see below), whose sum is σ = 257290075728. Its totient is φ = 47091133440.

The previous prime is 120121020017. The next prime is 120121020023. The reversal of 120121020020 is 20020121021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (120121020017) and next prime (120121020023).

It can be written as a sum of positive squares in 8 ways, for example, as 409171984 + 119711848036 = 20228^2 + 345994^2 .

It is a junction number, because it is equal to n+sod(n) for n = 120121019983 and 120121020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120121020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932750 + ... + 1053690.

It is an arithmetic number, because the mean of its divisors is an integer number (5360209911).

Almost surely, 2^120121020020 is an apocalyptic number.

120121020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

120121020020 is an abundant number, since it is smaller than the sum of its proper divisors (137169055708).

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

120121020020 is a wasteful number, since it uses less digits than its factorization.

120121020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121940 (or 121938 counting only the distinct ones).

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

Adding to 120121020020 its reverse (20020121021), we get a palindrome (140141141041).

The spelling of 120121020020 in words is "one hundred twenty billion, one hundred twenty-one million, twenty thousand, twenty".