121131031111 has 2 divisors, whose sum is σ = 121131031112. Its totient is φ = 121131031110.

The previous prime is 121131031093. The next prime is 121131031117. The reversal of 121131031111 is 111130131121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121131031111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121131031117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60565515555 + 60565515556.

It is an arithmetic number, because the mean of its divisors is an integer number (60565515556).

Almost surely, 2^121131031111 is an apocalyptic number.

121131031111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121131031111 is an equidigital number, since it uses as much as digits as its factorization.

121131031111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 121131031111 its reverse (111130131121), we get a palindrome (232261162232).

It can be divided in two parts, 1211310 and 31111, that added together give a palindrome (1242421).

The spelling of 121131031111 in words is "one hundred twenty-one billion, one hundred thirty-one million, thirty-one thousand, one hundred eleven".