31220111212 has 24 divisors (see below), whose sum is σ = 58080158640. Its totient is φ = 14642049600.

The previous prime is 31220111183. The next prime is 31220111213. The reversal of 31220111212 is 21211102213.

It is not an unprimeable number, because it can be changed into a prime (31220111213) 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 7 ways as a sum of consecutive naturals, for example, 2025943 + ... + 2041294.

It is an arithmetic number, because the mean of its divisors is an integer number (2420006610).

Almost surely, 2^31220111212 is an apocalyptic number.

It is an amenable number.

31220111212 is a deficient number, since it is larger than the sum of its proper divisors (26860047428).

31220111212 is a wasteful number, since it uses less digits than its factorization.

31220111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067361 (or 4067359 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31220111212 its reverse (21211102213), we get a palindrome (52431213425).

The spelling of 31220111212 in words is "thirty-one billion, two hundred twenty million, one hundred eleven thousand, two hundred twelve".