31211123111321 has 8 divisors (see below), whose sum is σ = 33151320972360. Its totient is φ = 29282508521728.

The previous prime is 31211123111299. The next prime is 31211123111323. The reversal of 31211123111321 is 12311132111213.

It can be written as a sum of positive squares in 4 ways, for example, as 75839101321 + 31135284010000 = 275389^2 + 5579900^2 .

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 31211123111321 - 2⁶ = 31211123111257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211123111323) 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, 2895812306 + ... + 2895823083.

It is an arithmetic number, because the mean of its divisors is an integer number (4143915121545).

Almost surely, 2^{31211123111321} is an apocalyptic number.

It is an amenable number.

31211123111321 is a deficient number, since it is larger than the sum of its proper divisors (1940197861039).

31211123111321 is a wasteful number, since it uses less digits than its factorization.

31211123111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791635723.

The product of its digits is 216, while the sum is 23.

Adding to 31211123111321 its reverse (12311132111213), we get a palindrome (43522255222534).

The spelling of 31211123111321 in words is "thirty-one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred eleven thousand, three hundred twenty-one".