1210001990120 has 64 divisors (see below), whose sum is σ = 3394291305600. Its totient is φ = 377143476480.

The previous prime is 1210001990081. The next prime is 1210001990123. The reversal of 1210001990120 is 210991000121.

It is a super-2 number, since 2×1210001990120² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1210001990120.

It is not an unprimeable number, because it can be changed into a prime (1210001990123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196425815 + ... + 196431974.

It is an arithmetic number, because the mean of its divisors is an integer number (53035801650).

Almost surely, 2^{1210001990120} is an apocalyptic number.

1210001990120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210001990120 is an abundant number, since it is smaller than the sum of its proper divisors (2184289315480).

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

1210001990120 is a wasteful number, since it uses less digits than its factorization.

1210001990120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392857818 (or 392857814 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

Adding to 1210001990120 its reverse (210991000121), we get a palindrome (1420992990241).

The spelling of 1210001990120 in words is "one trillion, two hundred ten billion, one million, nine hundred ninety thousand, one hundred twenty".