2131112021 has 2 divisors, whose sum is σ = 2131112022. Its totient is φ = 2131112020.

The previous prime is 2131111987. The next prime is 2131112047. The reversal of 2131112021 is 1202111312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2045752900 + 85359121 = 45230^2 + 9239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131112021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131111987 and 2131112005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065556010 + 1065556011.

It is an arithmetic number, because the mean of its divisors is an integer number (1065556011).

Almost surely, 2^2131112021 is an apocalyptic number.

It is an amenable number.

2131112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131112021 is an equidigital number, since it uses as much as digits as its factorization.

2131112021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2131112021 is about 46163.9688610067. The cubic root of 2131112021 is about 1286.8722215002.

Adding to 2131112021 its reverse (1202111312), we get a palindrome (3333223333).

The spelling of 2131112021 in words is "two billion, one hundred thirty-one million, one hundred twelve thousand, twenty-one".