31320251621216 has 24 divisors (see below), whose sum is σ = 61672595947704. Its totient is φ = 15657370110720.

The previous prime is 31320251621189. The next prime is 31320251621221. The reversal of 31320251621216 is 61212615202313.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85930925 + ... + 86294636.

It is an arithmetic number, because the mean of its divisors is an integer number (2569691497821).

Almost surely, 2^{31320251621216} is an apocalyptic number.

It is an amenable number.

31320251621216 is a deficient number, since it is larger than the sum of its proper divisors (30352344326488).

31320251621216 is a wasteful number, since it uses less digits than its factorization.

31320251621216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172231254 (or 172231246 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 31320251621216 its reverse (61212615202313), we get a palindrome (92532866823529).

The spelling of 31320251621216 in words is "thirty-one trillion, three hundred twenty billion, two hundred fifty-one million, six hundred twenty-one thousand, two hundred sixteen".