31111422502121 has 12 divisors (see below), whose sum is σ = 33691071648780. Its totient is φ = 28716214512960.

The previous prime is 31111422502049. The next prime is 31111422502207. The reversal of 31111422502121 is 12120522411113.

It can be written as a sum of positive squares in 6 ways, for example, as 1408104996496 + 29703317505625 = 1186636^2 + 5450075^2 .

It is not a de Polignac number, because 31111422502121 - 2¹⁰ = 31111422501097 is a prime.

It is a super-2 number, since 2×31111422502121² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31111422502621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4069166 + ... + 8875863.

It is an arithmetic number, because the mean of its divisors is an integer number (2807589304065).

Almost surely, 2^{31111422502121} is an apocalyptic number.

It is an amenable number.

31111422502121 is a deficient number, since it is larger than the sum of its proper divisors (2579649146659).

31111422502121 is a wasteful number, since it uses less digits than its factorization.

31111422502121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12959276 (or 12959263 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 31111422502121 its reverse (12120522411113), we get a palindrome (43231944913234).

The spelling of 31111422502121 in words is "thirty-one trillion, one hundred eleven billion, four hundred twenty-two million, five hundred two thousand, one hundred twenty-one".