31200212111 has 2 divisors, whose sum is σ = 31200212112. Its totient is φ = 31200212110.

The previous prime is 31200212083. The next prime is 31200212117. The reversal of 31200212111 is 11121200213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31200212111 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31200212117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600106055 + 15600106056.

It is an arithmetic number, because the mean of its divisors is an integer number (15600106056).

Almost surely, 2^31200212111 is an apocalyptic number.

31200212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200212111 is an equidigital number, since it uses as much as digits as its factorization.

31200212111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31200212111 its reverse (11121200213), we get a palindrome (42321412324).

The spelling of 31200212111 in words is "thirty-one billion, two hundred million, two hundred twelve thousand, one hundred eleven".