31231120113211 has 2 divisors, whose sum is σ = 31231120113212. Its totient is φ = 31231120113210.

The previous prime is 31231120113203. The next prime is 31231120113233. The reversal of 31231120113211 is 11231102113213.

It is an a-pointer prime, because the next prime (31231120113233) can be obtained adding 31231120113211 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31231120113211 - 2³ = 31231120113203 is a prime.

It is not a weakly prime, because it can be changed into another prime (31231120113311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615560056605 + 15615560056606.

It is an arithmetic number, because the mean of its divisors is an integer number (15615560056606).

Almost surely, 2^{31231120113211} is an apocalyptic number.

31231120113211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231120113211 is an equidigital number, since it uses as much as digits as its factorization.

31231120113211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31231120113211 its reverse (11231102113213), we get a palindrome (42462222226424).

The spelling of 31231120113211 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, one hundred thirteen thousand, two hundred eleven".