31223402211 has 4 divisors (see below), whose sum is σ = 41631202952. Its totient is φ = 20815601472.

The previous prime is 31223402173. The next prime is 31223402239. The reversal of 31223402211 is 11220432213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11220432213 = 3 ⋅3740144071.

It is not a de Polignac number, because 31223402211 - 2²² = 31219207907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223402011) 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 3 ways as a sum of consecutive naturals, for example, 5203900366 + ... + 5203900371.

It is an arithmetic number, because the mean of its divisors is an integer number (10407800738).

Almost surely, 2^31223402211 is an apocalyptic number.

31223402211 is a deficient number, since it is larger than the sum of its proper divisors (10407800741).

31223402211 is a wasteful number, since it uses less digits than its factorization.

31223402211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407800740.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31223402211 its reverse (11220432213), we get a palindrome (42443834424).

The spelling of 31223402211 in words is "thirty-one billion, two hundred twenty-three million, four hundred two thousand, two hundred eleven".