31212213611 has 2 divisors, whose sum is σ = 31212213612. Its totient is φ = 31212213610.

The previous prime is 31212213607. The next prime is 31212213647. The reversal of 31212213611 is 11631221213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31212213611 - 2² = 31212213607 is a prime.

It is not a weakly prime, because it can be changed into another prime (31212213601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606106805 + 15606106806.

It is an arithmetic number, because the mean of its divisors is an integer number (15606106806).

Almost surely, 2^31212213611 is an apocalyptic number.

31212213611 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212213611 is an equidigital number, since it uses as much as digits as its factorization.

31212213611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

Adding to 31212213611 its reverse (11631221213), we get a palindrome (42843434824).

The spelling of 31212213611 in words is "thirty-one billion, two hundred twelve million, two hundred thirteen thousand, six hundred eleven".