31021320203213 has 8 divisors (see below), whose sum is σ = 32654147771520. Its totient is φ = 29388505285440.

The previous prime is 31021320203149. The next prime is 31021320203231. The reversal of 31021320203213 is 31230202312013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31021320203213 - 2⁶ = 31021320203149 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 (31021320203413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2094908 + ... + 8150538.

It is an arithmetic number, because the mean of its divisors is an integer number (4081768471440).

Almost surely, 2^{31021320203213} is an apocalyptic number.

It is an amenable number.

31021320203213 is a deficient number, since it is larger than the sum of its proper divisors (1632827568307).

31021320203213 is a wasteful number, since it uses less digits than its factorization.

31021320203213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6325267.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31021320203213 its reverse (31230202312013), we get a palindrome (62251522515226).

The spelling of 31021320203213 in words is "thirty-one trillion, twenty-one billion, three hundred twenty million, two hundred three thousand, two hundred thirteen".