31210212073 has 2 divisors, whose sum is σ = 31210212074. Its totient is φ = 31210212072.

The previous prime is 31210212053. The next prime is 31210212107. The reversal of 31210212073 is 37021201213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20912630544 + 10297581529 = 144612^2 + 101477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31210212073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31210212053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605106036 + 15605106037.

It is an arithmetic number, because the mean of its divisors is an integer number (15605106037).

Almost surely, 2^31210212073 is an apocalyptic number.

It is an amenable number.

31210212073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210212073 is an equidigital number, since it uses as much as digits as its factorization.

31210212073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 31210212073 its reverse (37021201213), we get a palindrome (68231413286).

The spelling of 31210212073 in words is "thirty-one billion, two hundred ten million, two hundred twelve thousand, seventy-three".