31213210211 has 2 divisors, whose sum is σ = 31213210212. Its totient is φ = 31213210210.

The previous prime is 31213210177. The next prime is 31213210253. The reversal of 31213210211 is 11201231213.

It is a weak prime.

It is an emirp because it is prime and its reverse (11201231213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31213210211 - 2¹⁰ = 31213209187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31213210211.

It is not a weakly prime, because it can be changed into another prime (31213210261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606605105 + 15606605106.

It is an arithmetic number, because the mean of its divisors is an integer number (15606605106).

Almost surely, 2^31213210211 is an apocalyptic number.

31213210211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213210211 is an equidigital number, since it uses as much as digits as its factorization.

31213210211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31213210211 its reverse (11201231213), we get a palindrome (42414441424).

The spelling of 31213210211 in words is "thirty-one billion, two hundred thirteen million, two hundred ten thousand, two hundred eleven".