31111130121 has 16 divisors (see below), whose sum is σ = 41892589440. Its totient is φ = 20535292800.

The previous prime is 31111130107. The next prime is 31111130129. The reversal of 31111130121 is 12103111113.

It is not a de Polignac number, because 31111130121 - 2¹⁰ = 31111129097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31111130121.

It is not an unprimeable number, because it can be changed into a prime (31111130129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3054325 + ... + 3064493.

It is an arithmetic number, because the mean of its divisors is an integer number (2618286840).

Almost surely, 2^31111130121 is an apocalyptic number.

It is an amenable number.

31111130121 is a deficient number, since it is larger than the sum of its proper divisors (10781459319).

31111130121 is a wasteful number, since it uses less digits than its factorization.

31111130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20176.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 31111130121 its reverse (12103111113), we get a palindrome (43214241234).

The spelling of 31111130121 in words is "thirty-one billion, one hundred eleven million, one hundred thirty thousand, one hundred twenty-one".