21354008 has 16 divisors (see below), whose sum is σ = 43118880. Its totient is φ = 9855648.

The previous prime is 21354007. The next prime is 21354013. The reversal of 21354008 is 80045312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354007) 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, 102560 + ... + 102767.

It is an arithmetic number, because the mean of its divisors is an integer number (2694930).

Almost surely, 2^21354008 is an apocalyptic number.

It is an amenable number.

21354008 is an abundant number, since it is smaller than the sum of its proper divisors (21764872).

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

21354008 is a wasteful number, since it uses less digits than its factorization.

21354008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205346 (or 205342 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21354008 is about 4621.0397098489. The cubic root of 21354008 is about 277.4340746460.

The spelling of 21354008 in words is "twenty-one million, three hundred fifty-four thousand, eight".