2101001220121 has 4 divisors (see below), whose sum is σ = 2122661026612. Its totient is φ = 2079341413632.

The previous prime is 2101001220107. The next prime is 2101001220193. The reversal of 2101001220121 is 1210221001012.

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 896451069721 + 1204550150400 = 946811^2 + 1097520^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101001220121 - 2⁹ = 2101001219609 is a prime.

It is a super-2 number, since 2×2101001220121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101001220821) 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, 10829903100 + ... + 10829903293.

It is an arithmetic number, because the mean of its divisors is an integer number (530665256653).

Almost surely, 2^{2101001220121} is an apocalyptic number.

It is an amenable number.

2101001220121 is a deficient number, since it is larger than the sum of its proper divisors (21659806491).

2101001220121 is an equidigital number, since it uses as much as digits as its factorization.

2101001220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21659806490.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2101001220121 its reverse (1210221001012), we get a palindrome (3311222221133).

The spelling of 2101001220121 in words is "two trillion, one hundred one billion, one million, two hundred twenty thousand, one hundred twenty-one".