31123304012 has 12 divisors (see below), whose sum is σ = 54482735160. Its totient is φ = 15556808256.

The previous prime is 31123304011. The next prime is 31123304077. The reversal of 31123304012 is 21040332113.

It is a super-2 number, since 2×31123304012² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123304011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196462 + ... + 1222197.

It is an arithmetic number, because the mean of its divisors is an integer number (4540227930).

Almost surely, 2^31123304012 is an apocalyptic number.

It is an amenable number.

31123304012 is a deficient number, since it is larger than the sum of its proper divisors (23359431148).

31123304012 is a wasteful number, since it uses less digits than its factorization.

31123304012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421880 (or 2421878 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31123304012 its reverse (21040332113), we get a palindrome (52163636125).

The spelling of 31123304012 in words is "thirty-one billion, one hundred twenty-three million, three hundred four thousand, twelve".