31302220211231 has 2 divisors, whose sum is σ = 31302220211232. Its totient is φ = 31302220211230.

The previous prime is 31302220211191. The next prime is 31302220211333. The reversal of 31302220211231 is 13211202220313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31302220211231 - 2¹⁸ = 31302219949087 is a prime.

It is a super-2 number, since 2×31302220211231² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31302220211197 and 31302220211206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1302220211231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15651110105615 + 15651110105616.

It is an arithmetic number, because the mean of its divisors is an integer number (15651110105616).

Almost surely, 2^{31302220211231} is an apocalyptic number.

31302220211231 is a deficient number, since it is larger than the sum of its proper divisors (1).

31302220211231 is an equidigital number, since it uses as much as digits as its factorization.

31302220211231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31302220211231 its reverse (13211202220313), we get a palindrome (44513422431544).

The spelling of 31302220211231 in words is "thirty-one trillion, three hundred two billion, two hundred twenty million, two hundred eleven thousand, two hundred thirty-one".