31220230211 has 2 divisors, whose sum is σ = 31220230212. Its totient is φ = 31220230210.

The previous prime is 31220230201. The next prime is 31220230213. The reversal of 31220230211 is 11203202213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220230211 is a prime.

Together with 31220230213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220230211.

It is not a weakly prime, because it can be changed into another prime (31220230213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610115105 + 15610115106.

It is an arithmetic number, because the mean of its divisors is an integer number (15610115106).

Almost surely, 2^31220230211 is an apocalyptic number.

31220230211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220230211 is an equidigital number, since it uses as much as digits as its factorization.

31220230211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31220230211 its reverse (11203202213), we get a palindrome (42423432424).

The spelling of 31220230211 in words is "thirty-one billion, two hundred twenty million, two hundred thirty thousand, two hundred eleven".