31503320012 has 6 divisors (see below), whose sum is σ = 55130810028. Its totient is φ = 15751660004.

The previous prime is 31503319963. The next prime is 31503320021. The reversal of 31503320012 is 21002330513.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3937914998 + ... + 3937915005.

It is an arithmetic number, because the mean of its divisors is an integer number (9188468338).

Almost surely, 2^31503320012 is an apocalyptic number.

It is an amenable number.

31503320012 is a deficient number, since it is larger than the sum of its proper divisors (23627490016).

31503320012 is a wasteful number, since it uses less digits than its factorization.

31503320012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7875830007 (or 7875830005 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

Adding to 31503320012 its reverse (21002330513), we get a palindrome (52505650525).

The spelling of 31503320012 in words is "thirty-one billion, five hundred three million, three hundred twenty thousand, twelve".