2101020211121 has 4 divisors (see below), whose sum is σ = 2262637150452. Its totient is φ = 1939403271792.

The previous prime is 2101020211099. The next prime is 2101020211123. The reversal of 2101020211121 is 1211120201012.

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 1163345602225 + 937674608896 = 1078585^2 + 968336^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101020211121 - 2³⁸ = 1826142304177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2101020211096 and 2101020211105.

It is not an unprimeable number, because it can be changed into a prime (2101020211123) 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, 80808469646 + ... + 80808469671.

It is an arithmetic number, because the mean of its divisors is an integer number (565659287613).

Almost surely, 2^{2101020211121} is an apocalyptic number.

It is an amenable number.

2101020211121 is a deficient number, since it is larger than the sum of its proper divisors (161616939331).

2101020211121 is a wasteful number, since it uses less digits than its factorization.

2101020211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161616939330.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2101020211121 its reverse (1211120201012), we get a palindrome (3312140412133).

The spelling of 2101020211121 in words is "two trillion, one hundred one billion, twenty million, two hundred eleven thousand, one hundred twenty-one".