31221212243 has 16 divisors (see below), whose sum is σ = 35423539200. Its totient is φ = 27278791200.

The previous prime is 31221212203. The next prime is 31221212261. The reversal of 31221212243 is 34221212213.

It is a cyclic number.

It is not a de Polignac number, because 31221212243 - 2⁶ = 31221212179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31221212203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229388 + ... + 339206.

It is an arithmetic number, because the mean of its divisors is an integer number (2213971200).

Almost surely, 2^31221212243 is an apocalyptic number.

31221212243 is a deficient number, since it is larger than the sum of its proper divisors (4202326957).

31221212243 is a wasteful number, since it uses less digits than its factorization.

31221212243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111002.

The product of its digits is 1152, while the sum is 23.

Adding to 31221212243 its reverse (34221212213), we get a palindrome (65442424456).

The spelling of 31221212243 in words is "thirty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred forty-three".