20311331031121 has 16 divisors (see below), whose sum is σ = 22522673955600. Its totient is φ = 18195298092288.

The previous prime is 20311331031109. The next prime is 20311331031139. The reversal of 20311331031121 is 12113013311302.

It can be written as a sum of positive squares in 8 ways, for example, as 1094408899600 + 19216922131521 = 1046140^2 + 4383711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311331031121 - 2⁷ = 20311331030993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20311331031092 and 20311331031101.

It is not an unprimeable number, because it can be changed into a prime (20311331031161) 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, 54089626 + ... + 54463843.

It is an arithmetic number, because the mean of its divisors is an integer number (1407667122225).

Almost surely, 2^{20311331031121} is an apocalyptic number.

It is an amenable number.

20311331031121 is a deficient number, since it is larger than the sum of its proper divisors (2211342924479).

20311331031121 is a wasteful number, since it uses less digits than its factorization.

20311331031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108553908.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 20311331031121 its reverse (12113013311302), we get a palindrome (32424344342423).

The spelling of 20311331031121 in words is "twenty trillion, three hundred eleven billion, three hundred thirty-one million, thirty-one thousand, one hundred twenty-one".