31212013200031 has 4 divisors (see below), whose sum is σ = 31216915360192. Its totient is φ = 31207111039872.

The previous prime is 31212013200013. The next prime is 31212013200037. The reversal of 31212013200031 is 13000231021213.

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 31212013200031 - 2²¹ = 31212011102879 is a prime.

It is a super-2 number, since 2×31212013200031² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212013199981 and 31212013200008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212013200037) 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, 2451070530 + ... + 2451083263.

It is an arithmetic number, because the mean of its divisors is an integer number (7804228840048).

Almost surely, 2^{31212013200031} is an apocalyptic number.

31212013200031 is a deficient number, since it is larger than the sum of its proper divisors (4902160161).

31212013200031 is an equidigital number, since it uses as much as digits as its factorization.

31212013200031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902160160.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31212013200031 its reverse (13000231021213), we get a palindrome (44212244221244).

The spelling of 31212013200031 in words is "thirty-one trillion, two hundred twelve billion, thirteen million, two hundred thousand, thirty-one".