31212103123209 has 8 divisors (see below), whose sum is σ = 41781938843232. Its totient is φ = 20725168076000.

The previous prime is 31212103123153. The next prime is 31212103123231. The reversal of 31212103123209 is 90232130121213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31212103123209 - 2¹⁹ = 31212102598921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31212103123709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20725167324 + ... + 20725168829.

It is an arithmetic number, because the mean of its divisors is an integer number (5222742355404).

Almost surely, 2^{31212103123209} is an apocalyptic number.

It is an amenable number.

31212103123209 is a deficient number, since it is larger than the sum of its proper divisors (10569835720023).

31212103123209 is a wasteful number, since it uses less digits than its factorization.

31212103123209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41450336407.

The product of its (nonzero) digits is 3888, while the sum is 30.

The spelling of 31212103123209 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred twenty-three thousand, two hundred nine".