31213110011 has 2 divisors, whose sum is σ = 31213110012. Its totient is φ = 31213110010.

The previous prime is 31213109999. The next prime is 31213110013. The reversal of 31213110011 is 11001131213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31213110011 is a prime.

Together with 31213110013, 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 (31213110013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606555005 + 15606555006.

It is an arithmetic number, because the mean of its divisors is an integer number (15606555006).

Almost surely, 2^31213110011 is an apocalyptic number.

31213110011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213110011 is an equidigital number, since it uses as much as digits as its factorization.

31213110011 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 14.

Adding to 31213110011 its reverse (11001131213), we get a palindrome (42214241224).

It can be divided in two parts, 31213 and 110011, that multiplied together give a palindrome (3433773343).

The spelling of 31213110011 in words is "thirty-one billion, two hundred thirteen million, one hundred ten thousand, eleven".