20011131021 has 12 divisors (see below), whose sum is σ = 31037672832. Its totient is φ = 11434931928.

The previous prime is 20011131017. The next prime is 20011131031. The reversal of 20011131021 is 12013111002.

It is not a de Polignac number, because 20011131021 - 2² = 20011131017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011130988 and 20011131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011131031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68064925 + ... + 68065218.

It is an arithmetic number, because the mean of its divisors is an integer number (2586472736).

Almost surely, 2^20011131021 is an apocalyptic number.

20011131021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20011131021 is a deficient number, since it is larger than the sum of its proper divisors (11026541811).

20011131021 is a wasteful number, since it uses less digits than its factorization.

20011131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136130160 (or 136130153 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 20011131021 its reverse (12013111002), we get a palindrome (32024242023).

It can be divided in two parts, 200111 and 31021, that added together give a palindrome (231132).

The spelling of 20011131021 in words is "twenty billion, eleven million, one hundred thirty-one thousand, twenty-one".