2111200120121 has 4 divisors (see below), whose sum is σ = 2115535233792. Its totient is φ = 2106865006452.

The previous prime is 2111200120093. The next prime is 2111200120123. The reversal of 2111200120121 is 1210210021112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111200120121 - 2²⁶ = 2111133011257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111200120096 and 2111200120105.

It is not an unprimeable number, because it can be changed into a prime (2111200120123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167556105 + ... + 2167557078.

It is an arithmetic number, because the mean of its divisors is an integer number (528883808448).

Almost surely, 2^{2111200120121} is an apocalyptic number.

It is an amenable number.

2111200120121 is a deficient number, since it is larger than the sum of its proper divisors (4335113671).

2111200120121 is an equidigital number, since it uses as much as digits as its factorization.

2111200120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335113670.

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

Adding to 2111200120121 its reverse (1210210021112), we get a palindrome (3321410141233).

Subtracting from 2111200120121 its reverse (1210210021112), we obtain a palindrome (900990099009).

The spelling of 2111200120121 in words is "two trillion, one hundred eleven billion, two hundred million, one hundred twenty thousand, one hundred twenty-one".