10021887 has 10 divisors (see below), whose sum is σ = 14971088. Its totient is φ = 6681204.

The previous prime is 10021883. The next prime is 10021909. The reversal of 10021887 is 78812001.

It is not a de Polignac number, because 10021887 - 2² = 10021883 is a prime.

It is a super-3 number, since 3×10021887³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 10021887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 61783 + ... + 61944.

Almost surely, 2^10021887 is an apocalyptic number.

10021887 is a deficient number, since it is larger than the sum of its proper divisors (4949201).

10021887 is an equidigital number, since it uses as much as digits as its factorization.

10021887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123739 (or 123730 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 10021887 is about 3165.7364072203. The cubic root of 10021887 is about 215.6005348424.

Adding to 10021887 its reverse (78812001), we get a palindrome (88833888).

The spelling of 10021887 in words is "ten million, twenty-one thousand, eight hundred eighty-seven".