2100976987 has 4 divisors (see below), whose sum is σ = 2124583560. Its totient is φ = 2077370416.

The previous prime is 2100976951. The next prime is 2100976991. The reversal of 2100976987 is 7896790012.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100976987 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100976987.

It is not an unprimeable number, because it can be changed into a prime (2100976907) 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, 11803153 + ... + 11803330.

It is an arithmetic number, because the mean of its divisors is an integer number (531145890).

Almost surely, 2^2100976987 is an apocalyptic number.

2100976987 is a deficient number, since it is larger than the sum of its proper divisors (23606573).

2100976987 is an equidigital number, since it uses as much as digits as its factorization.

2100976987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23606572.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 2100976987 is about 45836.4155121231. The cubic root of 2100976987 is about 1280.7777229602. Note that the first 4 decimals are identical.

The spelling of 2100976987 in words is "two billion, one hundred million, nine hundred seventy-six thousand, nine hundred eighty-seven".