21280882 has 16 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 9047808.

The previous prime is 21280873. The next prime is 21280891. The reversal of 21280882 is 28808212.

It is an interprime number because it is at equal distance from previous prime (21280873) and next prime (21280891).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4207 + ... + 7762.

It is an arithmetic number, because the mean of its divisors is an integer number (2298240).

Almost surely, 2^21280882 is an apocalyptic number.

21280882 is a deficient number, since it is larger than the sum of its proper divisors (15490958).

21280882 is a wasteful number, since it uses less digits than its factorization.

21280882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12105.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 21280882 is about 4613.1206357519. The cubic root of 21280882 is about 277.1170249319.

The spelling of 21280882 in words is "twenty-one million, two hundred eighty thousand, eight hundred eighty-two".