21341808 has 30 divisors (see below), whose sum is σ = 59727824. Its totient is φ = 7113888.

The previous prime is 21341797. The next prime is 21341821. The reversal of 21341808 is 80814312.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 73960 + ... + 74247.

Almost surely, 2^21341808 is an apocalyptic number.

It is an amenable number.

21341808 is an abundant number, since it is smaller than the sum of its proper divisors (38386016).

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

21341808 is a wasteful number, since it uses less digits than its factorization.

21341808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148221 (or 148212 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21341808 is about 4619.7194720026. The cubic root of 21341808 is about 277.3812299138.

The spelling of 21341808 in words is "twenty-one million, three hundred forty-one thousand, eight hundred eight".