12131121011 has 2 divisors, whose sum is σ = 12131121012. Its totient is φ = 12131121010.

The previous prime is 12131120983. The next prime is 12131121017. The reversal of 12131121011 is 11012113121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12131121011 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131121017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065560505 + 6065560506.

It is an arithmetic number, because the mean of its divisors is an integer number (6065560506).

Almost surely, 2^12131121011 is an apocalyptic number.

12131121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131121011 is an equidigital number, since it uses as much as digits as its factorization.

12131121011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 12131121011 its reverse (11012113121), we get a palindrome (23143234132).

The spelling of 12131121011 in words is "twelve billion, one hundred thirty-one million, one hundred twenty-one thousand, eleven".