21204148 has 12 divisors (see below), whose sum is σ = 42408352. Its totient is φ = 9087480.

The previous prime is 21204143. The next prime is 21204199. The reversal of 21204148 is 84140212.

21204148 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204143) 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, 378618 + ... + 378673.

Almost surely, 2^21204148 is an apocalyptic number.

21204148 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21204148 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21204148 is a wasteful number, since it uses less digits than its factorization.

21204148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757302 (or 757300 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21204148 is about 4604.7961952729. The cubic root of 21204148 is about 276.7835502325.

The spelling of 21204148 in words is "twenty-one million, two hundred four thousand, one hundred forty-eight".