31223212211 has 8 divisors (see below), whose sum is σ = 31410529920. Its totient is φ = 31036186048.

The previous prime is 31223212193. The next prime is 31223212213. The reversal of 31223212211 is 11221232213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31223212211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223212213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143870 + ... + 288348.

It is an arithmetic number, because the mean of its divisors is an integer number (3926316240).

Almost surely, 2^31223212211 is an apocalyptic number.

31223212211 is a deficient number, since it is larger than the sum of its proper divisors (187317709).

31223212211 is a wasteful number, since it uses less digits than its factorization.

31223212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145773.

The product of its digits is 288, while the sum is 20.

Adding to 31223212211 its reverse (11221232213), we get a palindrome (42444444424).

The spelling of 31223212211 in words is "thirty-one billion, two hundred twenty-three million, two hundred twelve thousand, two hundred eleven".