1000120002120 has 320 divisors, whose sum is σ = 3568293978480. Its totient is φ = 250372767744.

The previous prime is 1000120002097. The next prime is 1000120002127. The reversal of 1000120002120 is 212000210001.

It can be written as a sum of positive squares in 8 ways, for example, as 521541063684 + 478578938436 = 722178^2 + 691794^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1000120002127) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 21843892 + ... + 21889628.

Almost surely, 2^{1000120002120} is an apocalyptic number.

1000120002120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000120002120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784146989240).

1000120002120 is an abundant number, since it is smaller than the sum of its proper divisors (2568173976360).

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

1000120002120 is a wasteful number, since it uses less digits than its factorization.

1000120002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46174 (or 46161 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1000120002120 its reverse (212000210001), we get a palindrome (1212120212121).

The spelling of 1000120002120 in words is "one trillion, one hundred twenty million, two thousand, one hundred twenty".