2001220012123 has 2 divisors, whose sum is σ = 2001220012124. Its totient is φ = 2001220012122.

The previous prime is 2001220012111. The next prime is 2001220012147. The reversal of 2001220012123 is 3212100221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001220012123 - 2²⁹ = 2000683141211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001220012097 and 2001220012106.

It is not a weakly prime, because it can be changed into another prime (2001220012193) 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 as a sum of consecutive naturals, namely, 1000610006061 + 1000610006062.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610006062).

Almost surely, 2^{2001220012123} is an apocalyptic number.

2001220012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220012123 is an equidigital number, since it uses as much as digits as its factorization.

2001220012123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2001220012123 its reverse (3212100221002), we get a palindrome (5213320233125).

The spelling of 2001220012123 in words is "two trillion, one billion, two hundred twenty million, twelve thousand, one hundred twenty-three".