31122212031 has 12 divisors (see below), whose sum is σ = 44956082808. Its totient is φ = 20747321424.

The previous prime is 31122212027. The next prime is 31122212087. The reversal of 31122212031 is 13021222113.

It is not a de Polignac number, because 31122212031 - 2² = 31122212027 is a prime.

It is a super-2 number, since 2×31122212031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31122211995 and 31122212013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122212731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250236 + ... + 353358.

It is an arithmetic number, because the mean of its divisors is an integer number (3746340234).

Almost surely, 2^31122212031 is an apocalyptic number.

31122212031 is a deficient number, since it is larger than the sum of its proper divisors (13833870777).

31122212031 is a wasteful number, since it uses less digits than its factorization.

31122212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136662 (or 136659 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31122212031 its reverse (13021222113), we get a palindrome (44143434144).

The spelling of 31122212031 in words is "thirty-one billion, one hundred twenty-two million, two hundred twelve thousand, thirty-one".