21341405 has 8 divisors (see below), whose sum is σ = 25723872. Its totient is φ = 16997008.

The previous prime is 21341387. The next prime is 21341407. The reversal of 21341405 is 50414312.

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 21341405 - 2¹⁰ = 21340381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341407) 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, 8267 + ... + 10536.

It is an arithmetic number, because the mean of its divisors is an integer number (3215484).

Almost surely, 2^21341405 is an apocalyptic number.

It is an amenable number.

21341405 is a deficient number, since it is larger than the sum of its proper divisors (4382467).

21341405 is a wasteful number, since it uses less digits than its factorization.

21341405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19035.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21341405 is about 4619.6758544296. The cubic root of 21341405 is about 277.3794839615.

Adding to 21341405 its reverse (50414312), we get a palindrome (71755717).

The spelling of 21341405 in words is "twenty-one million, three hundred forty-one thousand, four hundred five".