31220230213 has 2 divisors, whose sum is σ = 31220230214. Its totient is φ = 31220230212.

The previous prime is 31220230211. The next prime is 31220230229. The reversal of 31220230213 is 31203202213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16092952164 + 15127278049 = 126858^2 + 122993^2 .

It is a cyclic number.

It is not a de Polignac number, because 31220230213 - 2¹ = 31220230211 is a prime.

Together with 31220230211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220230211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610115106 + 15610115107.

It is an arithmetic number, because the mean of its divisors is an integer number (15610115107).

Almost surely, 2^31220230213 is an apocalyptic number.

It is an amenable number.

31220230213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220230213 is an equidigital number, since it uses as much as digits as its factorization.

31220230213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31220230213 its reverse (31203202213), we get a palindrome (62423432426).

The spelling of 31220230213 in words is "thirty-one billion, two hundred twenty million, two hundred thirty thousand, two hundred thirteen".