21394608 has 40 divisors (see below), whose sum is σ = 58180800. Its totient is φ = 6755904.

The previous prime is 21394603. The next prime is 21394609. The reversal of 21394608 is 80649312.

It is not an unprimeable number, because it can be changed into a prime (21394601) 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 7 ways as a sum of consecutive naturals, for example, 10818 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (1454520).

Almost surely, 2^21394608 is an apocalyptic number.

It is an amenable number.

21394608 is an abundant number, since it is smaller than the sum of its proper divisors (36786192).

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

21394608 is a wasteful number, since it uses less digits than its factorization.

21394608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23489 (or 23483 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21394608 is about 4625.4305745520. The cubic root of 21394608 is about 277.6097901743.

The spelling of 21394608 in words is "twenty-one million, three hundred ninety-four thousand, six hundred eight".