2142020987 has 4 divisors (see below), whose sum is σ = 2142186936. Its totient is φ = 2141855040.

The previous prime is 2142020957. The next prime is 2142020999. The reversal of 2142020987 is 7890202412.

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 2142020987 - 2¹⁶ = 2141955451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2142020957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61814 + ... + 90027.

It is an arithmetic number, because the mean of its divisors is an integer number (535546734).

Almost surely, 2^2142020987 is an apocalyptic number.

2142020987 is a deficient number, since it is larger than the sum of its proper divisors (165949).

2142020987 is a wasteful number, since it uses less digits than its factorization.

2142020987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165948.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 2142020987 is about 46281.9725919283. The cubic root of 2142020987 is about 1289.0642788590.

The spelling of 2142020987 in words is "two billion, one hundred forty-two million, twenty thousand, nine hundred eighty-seven".