2101001323121 has 4 divisors (see below), whose sum is σ = 2103108647412. Its totient is φ = 2098893998832.

The previous prime is 2101001323079. The next prime is 2101001323153. The reversal of 2101001323121 is 1213231001012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 890077146721 + 1210924176400 = 943439^2 + 1100420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101001323121 - 2¹⁰ = 2101001322097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101001323121.

It is not an unprimeable number, because it can be changed into a prime (2101001323321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053660650 + ... + 1053662643.

It is an arithmetic number, because the mean of its divisors is an integer number (525777161853).

Almost surely, 2^{2101001323121} is an apocalyptic number.

It is an amenable number.

2101001323121 is a deficient number, since it is larger than the sum of its proper divisors (2107324291).

2101001323121 is an equidigital number, since it uses as much as digits as its factorization.

2101001323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107324290.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 2101001323121 its reverse (1213231001012), we get a palindrome (3314232324133).

The spelling of 2101001323121 in words is "two trillion, one hundred one billion, one million, three hundred twenty-three thousand, one hundred twenty-one".