2101124987 has 4 divisors (see below), whose sum is σ = 2262750000. Its totient is φ = 1939499976.

The previous prime is 2101124981. The next prime is 2101125011. The reversal of 2101124987 is 7894211012.

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 2101124987 - 2¹⁸ = 2100862843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101124981) 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, 80812487 + ... + 80812512.

It is an arithmetic number, because the mean of its divisors is an integer number (565687500).

Almost surely, 2^2101124987 is an apocalyptic number.

2101124987 is a deficient number, since it is larger than the sum of its proper divisors (161625013).

2101124987 is a wasteful number, since it uses less digits than its factorization.

2101124987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161625012.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 2101124987 is about 45838.0299205801. The cubic root of 2101124987 is about 1280.8077963742.

Adding to 2101124987 its reverse (7894211012), we get a palindrome (9995335999).

The spelling of 2101124987 in words is "two billion, one hundred one million, one hundred twenty-four thousand, nine hundred eighty-seven".