20031122131 has 4 divisors (see below), whose sum is σ = 20132803152. Its totient is φ = 19929441112.

The previous prime is 20031122129. The next prime is 20031122141. The reversal of 20031122131 is 13122113002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20031122131 - 2¹ = 20031122129 is a prime.

It is a super-2 number, since 2×20031122131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50840215 + ... + 50840608.

It is an arithmetic number, because the mean of its divisors is an integer number (5033200788).

Almost surely, 2^20031122131 is an apocalyptic number.

20031122131 is a deficient number, since it is larger than the sum of its proper divisors (101681021).

20031122131 is a wasteful number, since it uses less digits than its factorization.

20031122131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101681020.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20031122131 its reverse (13122113002), we get a palindrome (33153235133).

The spelling of 20031122131 in words is "twenty billion, thirty-one million, one hundred twenty-two thousand, one hundred thirty-one".