2111021020121 has 4 divisors (see below), whose sum is σ = 2273407252452. Its totient is φ = 1948634787792.

The previous prime is 2111021020079. The next prime is 2111021020123. The reversal of 2111021020121 is 1210201201112.

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 1239525955600 + 871495064521 = 1113340^2 + 933539^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111021020121 - 2¹⁴ = 2111021003737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111021020096 and 2111021020105.

It is not an unprimeable number, because it can be changed into a prime (2111021020123) 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, 81193116146 + ... + 81193116171.

It is an arithmetic number, because the mean of its divisors is an integer number (568351813113).

Almost surely, 2^{2111021020121} is an apocalyptic number.

It is an amenable number.

2111021020121 is a deficient number, since it is larger than the sum of its proper divisors (162386232331).

2111021020121 is a wasteful number, since it uses less digits than its factorization.

2111021020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162386232330.

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

Adding to 2111021020121 its reverse (1210201201112), we get a palindrome (3321222221233).

The spelling of 2111021020121 in words is "two trillion, one hundred eleven billion, twenty-one million, twenty thousand, one hundred twenty-one".