31123212211 has 24 divisors (see below), whose sum is σ = 38575902240. Its totient is φ = 24586638336.

The previous prime is 31123212203. The next prime is 31123212277. The reversal of 31123212211 is 11221232113.

It is not a de Polignac number, because 31123212211 - 2³ = 31123212203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123213211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752355 + ... + 792643.

It is an arithmetic number, because the mean of its divisors is an integer number (1607329260).

Almost surely, 2^31123212211 is an apocalyptic number.

31123212211 is a deficient number, since it is larger than the sum of its proper divisors (7452690029).

31123212211 is a wasteful number, since it uses less digits than its factorization.

31123212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40975 (or 40962 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 31123212211 its reverse (11221232113), we get a palindrome (42344444324).

The spelling of 31123212211 in words is "thirty-one billion, one hundred twenty-three million, two hundred twelve thousand, two hundred eleven".