21349338 has 8 divisors (see below), whose sum is σ = 42698688. Its totient is φ = 7116444.

The previous prime is 21349337. The next prime is 21349357. The reversal of 21349338 is 83394312.

It is a happy number.

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

21349338 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21349299 and 21349308.

It is not an unprimeable number, because it can be changed into a prime (21349337) 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, 1779106 + ... + 1779117.

It is an arithmetic number, because the mean of its divisors is an integer number (5337336).

Almost surely, 2^21349338 is an apocalyptic number.

21349338 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.

21349338 is a wasteful number, since it uses less digits than its factorization.

21349338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558228.

The product of its digits is 15552, while the sum is 33.

The square root of 21349338 is about 4620.5343846789. The cubic root of 21349338 is about 277.4138487538.

It can be divided in two parts, 213493 and 38, that added together give a triangular number (213531 = T₆₅₃).

The spelling of 21349338 in words is "twenty-one million, three hundred forty-nine thousand, three hundred thirty-eight".