2100131987 has 2 divisors, whose sum is σ = 2100131988. Its totient is φ = 2100131986.

The previous prime is 2100131981. The next prime is 2100132019. The reversal of 2100131987 is 7891310012.

It is an a-pointer prime, because the next prime (2100132019) can be obtained adding 2100131987 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2100131987 - 2⁶ = 2100131923 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100131981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050065993 + 1050065994.

It is an arithmetic number, because the mean of its divisors is an integer number (1050065994).

Almost surely, 2^2100131987 is an apocalyptic number.

2100131987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100131987 is an equidigital number, since it uses as much as digits as its factorization.

2100131987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 2100131987 is about 45827.1970231652. The cubic root of 2100131987 is about 1280.6059929655.

Adding to 2100131987 its reverse (7891310012), we get a palindrome (9991441999).

The spelling of 2100131987 in words is "two billion, one hundred million, one hundred thirty-one thousand, nine hundred eighty-seven".