31212101213203 has 4 divisors (see below), whose sum is σ = 31286593101960. Its totient is φ = 31137609324448.

The previous prime is 31212101213201. The next prime is 31212101213231. The reversal of 31212101213203 is 30231210121213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31212101213203 - 2¹ = 31212101213201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212101213201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37245943750 + ... + 37245944587.

It is an arithmetic number, because the mean of its divisors is an integer number (7821648275490).

Almost surely, 2^{31212101213203} is an apocalyptic number.

31212101213203 is a deficient number, since it is larger than the sum of its proper divisors (74491888757).

31212101213203 is an equidigital number, since it uses as much as digits as its factorization.

31212101213203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74491888756.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31212101213203 its reverse (30231210121213), we get a palindrome (61443311334416).

The spelling of 31212101213203 in words is "thirty-one trillion, two hundred twelve billion, one hundred one million, two hundred thirteen thousand, two hundred three".