21385158 has 8 divisors (see below), whose sum is σ = 42770328. Its totient is φ = 7128384.

The previous prime is 21385157. The next prime is 21385159. The reversal of 21385158 is 85158312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21385157) and next prime (21385159).

It is a sphenic number, since it is the product of 3 distinct primes.

21385158 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1782091 + ... + 1782102.

It is an arithmetic number, because the mean of its divisors is an integer number (5346291).

Almost surely, 2^21385158 is an apocalyptic number.

21385158 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.

21385158 is a wasteful number, since it uses less digits than its factorization.

21385158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564198.

The product of its digits is 9600, while the sum is 33.

The square root of 21385158 is about 4624.4089352046. The cubic root of 21385158 is about 277.5689107330.

The spelling of 21385158 in words is "twenty-one million, three hundred eighty-five thousand, one hundred fifty-eight".