2121887986 has 8 divisors (see below), whose sum is σ = 3184536924. Its totient is φ = 1060375680.

The previous prime is 2121887953. The next prime is 2121887993. The reversal of 2121887986 is 6897881212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1660970025 + 460917961 = 40755^2 + 21469^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2121887986² = 9004817250262272392, which contains 22 as substring.

It is an unprimeable number.

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, 279475 + ... + 286966.

Almost surely, 2^2121887986 is an apocalyptic number.

2121887986 is a deficient number, since it is larger than the sum of its proper divisors (1062648938).

2121887986 is a wasteful number, since it uses less digits than its factorization.

2121887986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568316.

The product of its digits is 774144, while the sum is 52.

The square root of 2121887986 is about 46063.9553881340. The cubic root of 2121887986 is about 1285.0128915117.

The spelling of 2121887986 in words is "two billion, one hundred twenty-one million, eight hundred eighty-seven thousand, nine hundred eighty-six".