130021987 has 2 divisors, whose sum is σ = 130021988. Its totient is φ = 130021986.

The previous prime is 130021963. The next prime is 130022021. The reversal of 130021987 is 789120031.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 130021987 - 2¹⁵ = 129989219 is a prime.

It is not a weakly prime, because it can be changed into another prime (130027987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65010993 + 65010994.

It is an arithmetic number, because the mean of its divisors is an integer number (65010994).

Almost surely, 2^130021987 is an apocalyptic number.

130021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

130021987 is an equidigital number, since it uses as much as digits as its factorization.

130021987 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 31.

The square root of 130021987 is about 11402.7184039596. The cubic root of 130021987 is about 506.6082597050.

The spelling of 130021987 in words is "one hundred thirty million, twenty-one thousand, nine hundred eighty-seven".