2120131987 has 4 divisors (see below), whose sum is σ = 2151775816. Its totient is φ = 2088488160.

The previous prime is 2120131957. The next prime is 2120132057. The reversal of 2120131987 is 7891310212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2120131987 - 2²³ = 2111743379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120131907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15821814 + ... + 15821947.

It is an arithmetic number, because the mean of its divisors is an integer number (537943954).

Almost surely, 2^2120131987 is an apocalyptic number.

2120131987 is a deficient number, since it is larger than the sum of its proper divisors (31643829).

2120131987 is an equidigital number, since it uses as much as digits as its factorization.

2120131987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31643828.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 2120131987 is about 46044.8909978078. The cubic root of 2120131987 is about 1284.6583166999.

The spelling of 2120131987 in words is "two billion, one hundred twenty million, one hundred thirty-one thousand, nine hundred eighty-seven".