31221120011 has 2 divisors, whose sum is σ = 31221120012. Its totient is φ = 31221120010.

The previous prime is 31221119999. The next prime is 31221120013. The reversal of 31221120011 is 11002112213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31221120011 is a prime.

Together with 31221120013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31221120013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610560005 + 15610560006.

It is an arithmetic number, because the mean of its divisors is an integer number (15610560006).

Almost surely, 2^31221120011 is an apocalyptic number.

31221120011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221120011 is an equidigital number, since it uses as much as digits as its factorization.

31221120011 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 14.

Adding to 31221120011 its reverse (11002112213), we get a palindrome (42223232224).

The spelling of 31221120011 in words is "thirty-one billion, two hundred twenty-one million, one hundred twenty thousand, eleven".