31313240121211 has 2 divisors, whose sum is σ = 31313240121212. Its totient is φ = 31313240121210.

The previous prime is 31313240121197. The next prime is 31313240121311. The reversal of 31313240121211 is 11212104231313.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313240121211 is a prime.

It is not a weakly prime, because it can be changed into another prime (31313240121011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656620060605 + 15656620060606.

It is an arithmetic number, because the mean of its divisors is an integer number (15656620060606).

Almost surely, 2^{31313240121211} is an apocalyptic number.

31313240121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313240121211 is an equidigital number, since it uses as much as digits as its factorization.

31313240121211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 31313240121211 its reverse (11212104231313), we get a palindrome (42525344352524).

The spelling of 31313240121211 in words is "thirty-one trillion, three hundred thirteen billion, two hundred forty million, one hundred twenty-one thousand, two hundred eleven".