31213223303121 has 20 divisors (see below), whose sum is σ = 46630771492800. Its totient is φ = 20807204123736.

The previous prime is 31213223303099. The next prime is 31213223303147. The reversal of 31213223303121 is 12130332231213.

31213223303121 is a `hidden beast` number, since 3 + 1 + 2 + 1 + 322 + 330 + 3 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 31213223303121 - 2⁷ = 31213223302993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31213223303191) 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 19 ways as a sum of consecutive naturals, for example, 13867581 + ... + 15960458.

It is an arithmetic number, because the mean of its divisors is an integer number (2331538574640).

Almost surely, 2^{31213223303121} is an apocalyptic number.

It is an amenable number.

31213223303121 is a deficient number, since it is larger than the sum of its proper divisors (15417548189679).

31213223303121 is a wasteful number, since it uses less digits than its factorization.

31213223303121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29840970 (or 29840961 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31213223303121 its reverse (12130332231213), we get a palindrome (43343555534334).

The spelling of 31213223303121 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twenty-three million, three hundred three thousand, one hundred twenty-one".