2142109987 has 2 divisors, whose sum is σ = 2142109988. Its totient is φ = 2142109986.

The previous prime is 2142109967. The next prime is 2142110057. The reversal of 2142109987 is 7899012412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2142109987 - 2⁷ = 2142109859 is a prime.

It is not a weakly prime, because it can be changed into another prime (2142109967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071054993 + 1071054994.

It is an arithmetic number, because the mean of its divisors is an integer number (1071054994).

Almost surely, 2^2142109987 is an apocalyptic number.

2142109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142109987 is an equidigital number, since it uses as much as digits as its factorization.

2142109987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 2142109987 is about 46282.9340794207. The cubic root of 2142109987 is about 1289.0821319570.

The spelling of 2142109987 in words is "two billion, one hundred forty-two million, one hundred nine thousand, nine hundred eighty-seven".