2120011987 has 2 divisors, whose sum is σ = 2120011988. Its totient is φ = 2120011986.

The previous prime is 2120011961. The next prime is 2120011997. The reversal of 2120011987 is 7891100212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120011987 is a prime.

It is a super-4 number, since 4×2120011987⁴ (a number of 38 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (2120011997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060005993 + 1060005994.

It is an arithmetic number, because the mean of its divisors is an integer number (1060005994).

Almost surely, 2^2120011987 is an apocalyptic number.

2120011987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120011987 is an equidigital number, since it uses as much as digits as its factorization.

2120011987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 2120011987 is about 46043.5879032032. The cubic root of 2120011987 is about 1284.6340789154.

The spelling of 2120011987 in words is "two billion, one hundred twenty million, eleven thousand, nine hundred eighty-seven".