31212113111203 has 4 divisors (see below), whose sum is σ = 31801020905808. Its totient is φ = 30623205316600.

The previous prime is 31212113111159. The next prime is 31212113111297. The reversal of 31212113111203 is 30211131121213.

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 31212113111203 - 2¹³ = 31212113103011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212113411203) 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, 294453897223 + ... + 294453897328.

It is an arithmetic number, because the mean of its divisors is an integer number (7950255226452).

Almost surely, 2^{31212113111203} is an apocalyptic number.

31212113111203 is a deficient number, since it is larger than the sum of its proper divisors (588907794605).

31212113111203 is an equidigital number, since it uses as much as digits as its factorization.

31212113111203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588907794604.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31212113111203 its reverse (30211131121213), we get a palindrome (61423244232416).

The spelling of 31212113111203 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred eleven thousand, two hundred three".