31223212103 has 4 divisors (see below), whose sum is σ = 32580743088. Its totient is φ = 29865681120.

The previous prime is 31223212099. The next prime is 31223212171. The reversal of 31223212103 is 30121232213.

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 31223212103 - 2² = 31223212099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223212193) 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, 678765458 + ... + 678765503.

It is an arithmetic number, because the mean of its divisors is an integer number (8145185772).

Almost surely, 2^31223212103 is an apocalyptic number.

31223212103 is a deficient number, since it is larger than the sum of its proper divisors (1357530985).

31223212103 is a wasteful number, since it uses less digits than its factorization.

31223212103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357530984.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31223212103 its reverse (30121232213), we get a palindrome (61344444316).

The spelling of 31223212103 in words is "thirty-one billion, two hundred twenty-three million, two hundred twelve thousand, one hundred three".