31321013212 has 12 divisors (see below), whose sum is σ = 54849558456. Its totient is φ = 15649710800.

The previous prime is 31321013179. The next prime is 31321013219. The reversal of 31321013212 is 21231012313.

It is a self number, because there is not a number n which added to its sum of digits gives 31321013212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321013219) 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, 2692423 + ... + 2704030.

It is an arithmetic number, because the mean of its divisors is an integer number (4570796538).

Almost surely, 2^31321013212 is an apocalyptic number.

It is an amenable number.

31321013212 is a deficient number, since it is larger than the sum of its proper divisors (23528545244).

31321013212 is a wasteful number, since it uses less digits than its factorization.

31321013212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397908 (or 5397906 counting only the distinct ones).

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

Adding to 31321013212 its reverse (21231012313), we get a palindrome (52552025525).

It can be divided in two parts, 3132101 and 3212, that added together give a palindrome (3135313).

The spelling of 31321013212 in words is "thirty-one billion, three hundred twenty-one million, thirteen thousand, two hundred twelve".