21343145 has 8 divisors (see below), whose sum is σ = 25861056. Its totient is φ = 16908336.

The previous prime is 21343141. The next prime is 21343151. The reversal of 21343145 is 54134312.

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 21343145 - 2² = 21343141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343145.

It is not an unprimeable number, because it can be changed into a prime (21343141) 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, 20207 + ... + 21236.

It is an arithmetic number, because the mean of its divisors is an integer number (3232632).

Almost surely, 2^21343145 is an apocalyptic number.

It is an amenable number.

21343145 is a deficient number, since it is larger than the sum of its proper divisors (4517911).

21343145 is a wasteful number, since it uses less digits than its factorization.

21343145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41551.

The product of its digits is 1440, while the sum is 23.

The square root of 21343145 is about 4619.8641754926. The cubic root of 21343145 is about 277.3870221591.

Adding to 21343145 its reverse (54134312), we get a palindrome (75477457).

The spelling of 21343145 in words is "twenty-one million, three hundred forty-three thousand, one hundred forty-five".