2131111020 has 24 divisors (see below), whose sum is σ = 5967111024. Its totient is φ = 568296256.

The previous prime is 2131111019. The next prime is 2131111039. The reversal of 2131111020 is 201111312.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2131110987 and 2131111005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17759199 + ... + 17759318.

It is an arithmetic number, because the mean of its divisors is an integer number (248629626).

Almost surely, 2^2131111020 is an apocalyptic number.

2131111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131111020 is an abundant number, since it is smaller than the sum of its proper divisors (3836000004).

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

2131111020 is a wasteful number, since it uses less digits than its factorization.

2131111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35518529 (or 35518527 counting only the distinct ones).

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

The square root of 2131111020 is about 46163.9580192167. The cubic root of 2131111020 is about 1286.8720200155.

Adding to 2131111020 its reverse (201111312), we get a palindrome (2332222332).

The spelling of 2131111020 in words is "two billion, one hundred thirty-one million, one hundred eleven thousand, twenty".