2121201031111 has 2 divisors, whose sum is σ = 2121201031112. Its totient is φ = 2121201031110.

The previous prime is 2121201031109. The next prime is 2121201031129. The reversal of 2121201031111 is 1111301021212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121201031111 - 2¹ = 2121201031109 is a prime.

Together with 2121201031109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121201031711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060600515555 + 1060600515556.

It is an arithmetic number, because the mean of its divisors is an integer number (1060600515556).

Almost surely, 2^{2121201031111} is an apocalyptic number.

2121201031111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121201031111 is an equidigital number, since it uses as much as digits as its factorization.

2121201031111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 2121201031111 its reverse (1111301021212), we get a palindrome (3232502052323).

The spelling of 2121201031111 in words is "two trillion, one hundred twenty-one billion, two hundred one million, thirty-one thousand, one hundred eleven".