2131111231020 has 36 divisors (see below), whose sum is σ = 6464370734640. Its totient is φ = 568296328224.

The previous prime is 2131111230977. The next prime is 2131111231021. The reversal of 2131111231020 is 201321111312.

2131111231020 is a `hidden beast` number, since 21 + 311 + 1 + 1 + 2 + 310 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2131111230984 and 2131111231002.

It is not an unprimeable number, because it can be changed into a prime (2131111231021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5919753240 + ... + 5919753599.

It is an arithmetic number, because the mean of its divisors is an integer number (179565853740).

Almost surely, 2^{2131111231020} is an apocalyptic number.

2131111231020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131111231020 is an abundant number, since it is smaller than the sum of its proper divisors (4333259503620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131111231020 is a wasteful number, since it uses less digits than its factorization.

2131111231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11839506854 (or 11839506849 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 2131111231020 its reverse (201321111312), we get a palindrome (2332432342332).

The spelling of 2131111231020 in words is "two trillion, one hundred thirty-one billion, one hundred eleven million, two hundred thirty-one thousand, twenty".