31220433124213 has 2 divisors, whose sum is σ = 31220433124214. Its totient is φ = 31220433124212.

The previous prime is 31220433124151. The next prime is 31220433124217. The reversal of 31220433124213 is 31242133402213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23012907169329 + 8207525954884 = 4797177^2 + 2864878^2 .

It is an emirp because it is prime and its reverse (31242133402213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31220433124213 - 2⁹ = 31220433123701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220433124217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610216562106 + 15610216562107.

It is an arithmetic number, because the mean of its divisors is an integer number (15610216562107).

Almost surely, 2^{31220433124213} is an apocalyptic number.

It is an amenable number.

31220433124213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220433124213 is an equidigital number, since it uses as much as digits as its factorization.

31220433124213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 31220433124213 its reverse (31242133402213), we get a palindrome (62462566526426).

The spelling of 31220433124213 in words is "thirty-one trillion, two hundred twenty billion, four hundred thirty-three million, one hundred twenty-four thousand, two hundred thirteen".