31212113112031 has 2 divisors, whose sum is σ = 31212113112032. Its totient is φ = 31212113112030.

The previous prime is 31212113111899. The next prime is 31212113112077. The reversal of 31212113112031 is 13021131121213.

It is a strong prime.

It is an emirp because it is prime and its reverse (13021131121213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212113112031 is a prime.

It is a super-2 number, since 2×31212113112031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212113111993 and 31212113112011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212113112731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606056556015 + 15606056556016.

It is an arithmetic number, because the mean of its divisors is an integer number (15606056556016).

Almost surely, 2^{31212113112031} is an apocalyptic number.

31212113112031 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212113112031 is an equidigital number, since it uses as much as digits as its factorization.

31212113112031 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 31212113112031 its reverse (13021131121213), we get a palindrome (44233244233244).

The spelling of 31212113112031 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred twelve thousand, thirty-one".