31123323212 has 6 divisors (see below), whose sum is σ = 54465815628. Its totient is φ = 15561661604.

The previous prime is 31123323211. The next prime is 31123323233. The reversal of 31123323212 is 21232332113.

It is a super-2 number, since 2×31123323212² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123323211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890415398 + ... + 3890415405.

It is an arithmetic number, because the mean of its divisors is an integer number (9077635938).

Almost surely, 2^31123323212 is an apocalyptic number.

It is an amenable number.

31123323212 is a deficient number, since it is larger than the sum of its proper divisors (23342492416).

31123323212 is a wasteful number, since it uses less digits than its factorization.

31123323212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7780830807 (or 7780830805 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 31123323212 its reverse (21232332113), we get a palindrome (52355655325).

The spelling of 31123323212 in words is "thirty-one billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred twelve".