21280876 has 12 divisors (see below), whose sum is σ = 37354408. Its totient is φ = 10608192.

The previous prime is 21280873. The next prime is 21280891. The reversal of 21280876 is 67808212.

It is not an unprimeable number, because it can be changed into a prime (21280873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6546 + ... + 9241.

Almost surely, 2^21280876 is an apocalyptic number.

It is an amenable number.

21280876 is a deficient number, since it is larger than the sum of its proper divisors (16073532).

21280876 is a wasteful number, since it uses less digits than its factorization.

21280876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16128 (or 16126 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 21280876 is about 4613.1199854329. The cubic root of 21280876 is about 277.1169988881.

The spelling of 21280876 in words is "twenty-one million, two hundred eighty thousand, eight hundred seventy-six".