31212212203423 has 16 divisors (see below), whose sum is σ = 31858950689280. Its totient is φ = 30572976581856.

The previous prime is 31212212203373. The next prime is 31212212203507. The reversal of 31212212203423 is 32430221221213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31212212203423 - 2²⁹ = 31211675332511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212212203391 and 31212212203400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212212203723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4941973 + ... + 9319201.

It is an arithmetic number, because the mean of its divisors is an integer number (1991184418080).

Almost surely, 2^{31212212203423} is an apocalyptic number.

31212212203423 is a deficient number, since it is larger than the sum of its proper divisors (646738485857).

31212212203423 is a wasteful number, since it uses less digits than its factorization.

31212212203423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4378086.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 31212212203423 its reverse (32430221221213), we get a palindrome (63642433424636).

The spelling of 31212212203423 in words is "thirty-one trillion, two hundred twelve billion, two hundred twelve million, two hundred three thousand, four hundred twenty-three".