21342349 has 8 divisors (see below), whose sum is σ = 24528960. Its totient is φ = 18190176.

The previous prime is 21342341. The next prime is 21342359. The reversal of 21342349 is 94324312.

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

It is a cyclic number.

It is not a de Polignac number, because 21342349 - 2³ = 21342341 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 (21342341) 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, 7264 + ... + 9769.

It is an arithmetic number, because the mean of its divisors is an integer number (3066120).

Almost surely, 2^21342349 is an apocalyptic number.

It is an amenable number.

21342349 is a deficient number, since it is larger than the sum of its proper divisors (3186611).

21342349 is a wasteful number, since it uses less digits than its factorization.

21342349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17219.

The product of its digits is 5184, while the sum is 28.

The square root of 21342349 is about 4619.7780249705. The cubic root of 21342349 is about 277.3835737011.

The spelling of 21342349 in words is "twenty-one million, three hundred forty-two thousand, three hundred forty-nine".