21124308 has 12 divisors (see below), whose sum is σ = 49290080. Its totient is φ = 7041432.

The previous prime is 21124289. The next prime is 21124321. The reversal of 21124308 is 80342112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880168 + ... + 880191.

Almost surely, 2^21124308 is an apocalyptic number.

It is an amenable number.

21124308 is an abundant number, since it is smaller than the sum of its proper divisors (28165772).

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

21124308 is a wasteful number, since it uses less digits than its factorization.

21124308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760366 (or 1760364 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21124308 is about 4596.1187974203. The cubic root of 21124308 is about 276.4357221798.

The spelling of 21124308 in words is "twenty-one million, one hundred twenty-four thousand, three hundred eight".