31121311121 has 8 divisors (see below), whose sum is σ = 31213409280. Its totient is φ = 31029270192.

The previous prime is 31121311061. The next prime is 31121311183. The reversal of 31121311121 is 12111312113.

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 31121311121 - 2¹⁸ = 31121048977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31121311121.

It is not an unprimeable number, because it can be changed into a prime (31121311021) 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, 1233410 + ... + 1258388.

It is an arithmetic number, because the mean of its divisors is an integer number (3901676160).

Almost surely, 2^31121311121 is an apocalyptic number.

It is an amenable number.

31121311121 is a deficient number, since it is larger than the sum of its proper divisors (92098159).

31121311121 is a wasteful number, since it uses less digits than its factorization.

31121311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28615.

The product of its digits is 36, while the sum is 17.

Adding to 31121311121 its reverse (12111312113), we get a palindrome (43232623234).

The spelling of 31121311121 in words is "thirty-one billion, one hundred twenty-one million, three hundred eleven thousand, one hundred twenty-one".