1210120100001 has 144 divisors (see below), whose sum is σ = 1994872815936. Its totient is φ = 732306137472.

The previous prime is 1210120099997. The next prime is 1210120100027. The reversal of 1210120100001 is 1000010210121.

It is a happy number.

It is not a de Polignac number, because 1210120100001 - 2² = 1210120099997 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210120100081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 199917691 + ... + 199923743.

It is an arithmetic number, because the mean of its divisors is an integer number (13853283444).

Almost surely, 2^{1210120100001} is an apocalyptic number.

It is an amenable number.

1210120100001 is a deficient number, since it is larger than the sum of its proper divisors (784752715935).

1210120100001 is an equidigital number, since it uses as much as digits as its factorization.

1210120100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6202 (or 6171 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1210120100001 its reverse (1000010210121), we get a palindrome (2210130310122).

The spelling of 1210120100001 in words is "one trillion, two hundred ten billion, one hundred twenty million, one hundred thousand, one".