31320120002 has 12 divisors (see below), whose sum is σ = 48656051106. Its totient is φ = 15120057120.

The previous prime is 31320120001. The next prime is 31320120023. The reversal of 31320120002 is 20002102313.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17135071801 + 14185048201 = 130901^2 + 119101^2 .

It is not an unprimeable number, because it can be changed into a prime (31320120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9308699 + ... + 9312062.

Almost surely, 2^31320120002 is an apocalyptic number.

31320120002 is a deficient number, since it is larger than the sum of its proper divisors (17335931104).

31320120002 is a wasteful number, since it uses less digits than its factorization.

31320120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18620821 (or 18620792 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31320120002 its reverse (20002102313), we get a palindrome (51322222315).

The spelling of 31320120002 in words is "thirty-one billion, three hundred twenty million, one hundred twenty thousand, two".