21273108 has 12 divisors (see below), whose sum is σ = 49637280. Its totient is φ = 7091032.

The previous prime is 21273107. The next prime is 21273121. The reversal of 21273108 is 80137212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886368 + ... + 886391.

It is an arithmetic number, because the mean of its divisors is an integer number (4136440).

Almost surely, 2^21273108 is an apocalyptic number.

It is an amenable number.

21273108 is an abundant number, since it is smaller than the sum of its proper divisors (28364172).

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

21273108 is a wasteful number, since it uses less digits than its factorization.

21273108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772766 (or 1772764 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 21273108 is about 4612.2779621354. The cubic root of 21273108 is about 277.0832767985.

The spelling of 21273108 in words is "twenty-one million, two hundred seventy-three thousand, one hundred eight".