31211243013 has 32 divisors (see below), whose sum is σ = 42354737152. Its totient is φ = 20441937600.

The previous prime is 31211242991. The next prime is 31211243027. The reversal of 31211243013 is 31034211213.

It is not a de Polignac number, because 31211243013 - 2¹⁰ = 31211241989 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 (31211243093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17926323 + ... + 17928063.

It is an arithmetic number, because the mean of its divisors is an integer number (1323585536).

Almost surely, 2^31211243013 is an apocalyptic number.

It is an amenable number.

31211243013 is a deficient number, since it is larger than the sum of its proper divisors (11143494139).

31211243013 is a wasteful number, since it uses less digits than its factorization.

31211243013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31211243013 its reverse (31034211213), we get a palindrome (62245454226).

The spelling of 31211243013 in words is "thirty-one billion, two hundred eleven million, two hundred forty-three thousand, thirteen".