31223321211 has 8 divisors (see below), whose sum is σ = 41632798480. Its totient is φ = 20814695712.

The previous prime is 31223321209. The next prime is 31223321237. The reversal of 31223321211 is 11212332213.

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

It is not a de Polignac number, because 31223321211 - 2¹ = 31223321209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223328211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121840 + ... + 278013.

It is an arithmetic number, because the mean of its divisors is an integer number (5204099810).

Almost surely, 2^31223321211 is an apocalyptic number.

31223321211 is a deficient number, since it is larger than the sum of its proper divisors (10409477269).

31223321211 is a wasteful number, since it uses less digits than its factorization.

31223321211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425885.

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

Adding to 31223321211 its reverse (11212332213), we get a palindrome (42435653424).

The spelling of 31223321211 in words is "thirty-one billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred eleven".