21880208 has 20 divisors (see below), whose sum is σ = 48449280. Its totient is φ = 9377184.

The previous prime is 21880171. The next prime is 21880231. The reversal of 21880208 is 80208812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97568 + ... + 97791.

It is an arithmetic number, because the mean of its divisors is an integer number (2422464).

Almost surely, 2^21880208 is an apocalyptic number.

21880208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21880208 is an abundant number, since it is smaller than the sum of its proper divisors (26569072).

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

21880208 is a wasteful number, since it uses less digits than its factorization.

21880208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195374 (or 195368 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 21880208 is about 4677.6284589522. The cubic root of 21880208 is about 279.6944285478.

The spelling of 21880208 in words is "twenty-one million, eight hundred eighty thousand, two hundred eight".