31212131030103 has 4 divisors (see below), whose sum is σ = 41616174706808. Its totient is φ = 20808087353400.

The previous prime is 31212131030089. The next prime is 31212131030131. The reversal of 31212131030103 is 30103013121213.

It is a happy number.

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

It is not a de Polignac number, because 31212131030103 - 2⁵ = 31212131030071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31212131030103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212131035103) 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, 5202021838348 + ... + 5202021838353.

It is an arithmetic number, because the mean of its divisors is an integer number (10404043676702).

Almost surely, 2^{31212131030103} is an apocalyptic number.

31212131030103 is a deficient number, since it is larger than the sum of its proper divisors (10404043676705).

31212131030103 is a wasteful number, since it uses less digits than its factorization.

31212131030103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404043676704.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 31212131030103 its reverse (30103013121213), we get a palindrome (61315144151316).

The spelling of 31212131030103 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirty-one million, thirty thousand, one hundred three".