21349158 has 8 divisors (see below), whose sum is σ = 42698328. Its totient is φ = 7116384.

The previous prime is 21349117. The next prime is 21349183. The reversal of 21349158 is 85194312.

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

21349158 is an admirable number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 1779091 + ... + 1779102.

It is an arithmetic number, because the mean of its divisors is an integer number (5337291).

Almost surely, 2^21349158 is an apocalyptic number.

21349158 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.

21349158 is a wasteful number, since it uses less digits than its factorization.

21349158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558198.

The product of its digits is 8640, while the sum is 33.

The square root of 21349158 is about 4620.5149063714. The cubic root of 21349158 is about 277.4130691101.

The spelling of 21349158 in words is "twenty-one million, three hundred forty-nine thousand, one hundred fifty-eight".