312123213031 has 16 divisors (see below), whose sum is σ = 364754850624. Its totient is φ = 261538677504.

The previous prime is 312123213029. The next prime is 312123213041. The reversal of 312123213031 is 130312321213.

It is a cyclic number.

It is not a de Polignac number, because 312123213031 - 2¹ = 312123213029 is a prime.

It is a super-2 number, since 2×312123213031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312123212993 and 312123213011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312123213001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415830 + ... + 1621363.

It is an arithmetic number, because the mean of its divisors is an integer number (22797178164).

Almost surely, 2^312123213031 is an apocalyptic number.

312123213031 is a deficient number, since it is larger than the sum of its proper divisors (52631637593).

312123213031 is a wasteful number, since it uses less digits than its factorization.

312123213031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3037530.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 312123213031 its reverse (130312321213), we get a palindrome (442435534244).

The spelling of 312123213031 in words is "three hundred twelve billion, one hundred twenty-three million, two hundred thirteen thousand, thirty-one".