21084876 has 18 divisors (see below), whose sum is σ = 53297972. Its totient is φ = 7028280.

The previous prime is 21084853. The next prime is 21084881. The reversal of 21084876 is 67848012.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 585691 = 21084876 / (2 + 1 + 0 + 8 + 4 + 8 + 7 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 21084876.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292810 + ... + 292881.

Almost surely, 2^21084876 is an apocalyptic number.

It is an amenable number.

21084876 is an abundant number, since it is smaller than the sum of its proper divisors (32213096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21084876 is a wasteful number, since it uses less digits than its factorization.

21084876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585701 (or 585696 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 21084876 is about 4591.8270873368. The cubic root of 21084876 is about 276.2636107761.

The spelling of 21084876 in words is "twenty-one million, eighty-four thousand, eight hundred seventy-six".