31223132211 has 4 divisors (see below), whose sum is σ = 41630842952. Its totient is φ = 20815421472.

The previous prime is 31223132207. The next prime is 31223132267. The reversal of 31223132211 is 11223132213.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31223132211 - 2² = 31223132207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223132911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5203855366 + ... + 5203855371.

It is an arithmetic number, because the mean of its divisors is an integer number (10407710738).

Almost surely, 2^31223132211 is an apocalyptic number.

31223132211 is a deficient number, since it is larger than the sum of its proper divisors (10407710741).

31223132211 is a wasteful number, since it uses less digits than its factorization.

31223132211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407710740.

The product of its digits is 432, while the sum is 21.

Adding to 31223132211 its reverse (11223132213), we get a palindrome (42446264424).

The spelling of 31223132211 in words is "thirty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, two hundred eleven".