2101020121111 has 4 divisors (see below), whose sum is σ = 2105762830632. Its totient is φ = 2096277411592.

The previous prime is 2101020121043. The next prime is 2101020121177. The reversal of 2101020121111 is 1111210201012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2101020121111 - 2¹¹ = 2101020119063 is a prime.

It is a super-2 number, since 2×2101020121111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101020121091 and 2101020121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101026121111) 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, 2371354096 + ... + 2371354981.

It is an arithmetic number, because the mean of its divisors is an integer number (526440707658).

Almost surely, 2^{2101020121111} is an apocalyptic number.

2101020121111 is a deficient number, since it is larger than the sum of its proper divisors (4742709521).

2101020121111 is an equidigital number, since it uses as much as digits as its factorization.

2101020121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742709520.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2101020121111 its reverse (1111210201012), we get a palindrome (3212230322123).

The spelling of 2101020121111 in words is "two trillion, one hundred one billion, twenty million, one hundred twenty-one thousand, one hundred eleven".