31321212101993 has 4 divisors (see below), whose sum is σ = 34168595020368. Its totient is φ = 28473829183620.

The previous prime is 31321212101909. The next prime is 31321212102071. The reversal of 31321212101993 is 39910121212313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31321212101993 - 2³⁰ = 31320138360169 is a prime.

It is a super-2 number, since 2×31321212101993² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31321212101693) by changing a digit.

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, 1423691459171 + ... + 1423691459192.

It is an arithmetic number, because the mean of its divisors is an integer number (8542148755092).

Almost surely, 2^{31321212101993} is an apocalyptic number.

It is an amenable number.

31321212101993 is a deficient number, since it is larger than the sum of its proper divisors (2847382918375).

31321212101993 is a wasteful number, since it uses less digits than its factorization.

31321212101993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847382918374.

The product of its (nonzero) digits is 17496, while the sum is 38.

The spelling of 31321212101993 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twelve million, one hundred one thousand, nine hundred ninety-three".