31231311322121 has 8 divisors (see below), whose sum is σ = 31374785561280. Its totient is φ = 31087898761392.

The previous prime is 31231311322117. The next prime is 31231311322147. The reversal of 31231311322121 is 12122311313213.

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 31231311322121 - 2² = 31231311322117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31231311322111) 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, 14404415 + ... + 16430148.

It is an arithmetic number, because the mean of its divisors is an integer number (3921848195160).

Almost surely, 2^{31231311322121} is an apocalyptic number.

It is an amenable number.

31231311322121 is a deficient number, since it is larger than the sum of its proper divisors (143474239159).

31231311322121 is a wasteful number, since it uses less digits than its factorization.

31231311322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30839215.

The product of its digits is 1296, while the sum is 26.

Adding to 31231311322121 its reverse (12122311313213), we get a palindrome (43353622635334).

The spelling of 31231311322121 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred eleven million, three hundred twenty-two thousand, one hundred twenty-one".