21568349 has 8 divisors (see below), whose sum is σ = 23794560. Its totient is φ = 19386400.

The previous prime is 21568333. The next prime is 21568357. The reversal of 21568349 is 94386512.

It is a happy number.

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

It is not a de Polignac number, because 21568349 - 2⁴ = 21568333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21568399) 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 7 ways as a sum of consecutive naturals, for example, 10037 + ... + 11994.

It is an arithmetic number, because the mean of its divisors is an integer number (2974320).

Almost surely, 2^21568349 is an apocalyptic number.

It is an amenable number.

21568349 is a deficient number, since it is larger than the sum of its proper divisors (2226211).

21568349 is a wasteful number, since it uses less digits than its factorization.

21568349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22131.

The product of its digits is 51840, while the sum is 38.

The square root of 21568349 is about 4644.1736616970. The cubic root of 21568349 is about 278.3592348834.

The spelling of 21568349 in words is "twenty-one million, five hundred sixty-eight thousand, three hundred forty-nine".