31121300011 has 2 divisors, whose sum is σ = 31121300012. Its totient is φ = 31121300010.

The previous prime is 31121299991. The next prime is 31121300101. The reversal of 31121300011 is 11000312113.

Together with next prime (31121300101) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121300011 - 2¹⁹ = 31120775723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31121299964 and 31121300000.

It is not a weakly prime, because it can be changed into another prime (31121370011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560650005 + 15560650006.

It is an arithmetic number, because the mean of its divisors is an integer number (15560650006).

Almost surely, 2^31121300011 is an apocalyptic number.

31121300011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121300011 is an equidigital number, since it uses as much as digits as its factorization.

31121300011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31121300011 its reverse (11000312113), we get a palindrome (42121612124).

The spelling of 31121300011 in words is "thirty-one billion, one hundred twenty-one million, three hundred thousand, eleven".