31121122031011 has 12 divisors (see below), whose sum is σ = 31876613974632. Its totient is φ = 30383146827936.

The previous prime is 31121122030969. The next prime is 31121122031101. The reversal of 31121122031011 is 11013022112113.

It is not a de Polignac number, because 31121122031011 - 2⁹ = 31121122030499 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 31121122031011.

It is not an unprimeable number, because it can be changed into a prime (31121122731011) 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, 13240 + ... + 7889386.

It is an arithmetic number, because the mean of its divisors is an integer number (2656384497886).

Almost surely, 2^{31121122031011} is an apocalyptic number.

31121122031011 is a deficient number, since it is larger than the sum of its proper divisors (755491943621).

31121122031011 is an equidigital number, since it uses as much as digits as its factorization.

31121122031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878370 (or 7878327 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31121122031011 its reverse (11013022112113), we get a palindrome (42134144143124).

The spelling of 31121122031011 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, thirty-one thousand, eleven".