2131222111111 has 2 divisors, whose sum is σ = 2131222111112. Its totient is φ = 2131222111110.

The previous prime is 2131222111103. The next prime is 2131222111159. The reversal of 2131222111111 is 1111112221312.

It is a m-pointer prime, because the next prime (2131222111159) can be obtained adding 2131222111111 to its product of digits (48).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2131222111111 - 2³ = 2131222111103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131222111171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065611055555 + 1065611055556.

It is an arithmetic number, because the mean of its divisors is an integer number (1065611055556).

Almost surely, 2^{2131222111111} is an apocalyptic number.

2131222111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131222111111 is an equidigital number, since it uses as much as digits as its factorization.

2131222111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 19.

Adding to 2131222111111 its reverse (1111112221312), we get a palindrome (3242334332423).

The spelling of 2131222111111 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred eleven".