21445341 has 8 divisors (see below), whose sum is σ = 28631904. Its totient is φ = 14277840.

The previous prime is 21445331. The next prime is 21445349. The reversal of 21445341 is 14354412.

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

It is not a de Polignac number, because 21445341 - 2¹⁷ = 21314269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (3578988).

Almost surely, 2^21445341 is an apocalyptic number.

It is an amenable number.

21445341 is a deficient number, since it is larger than the sum of its proper divisors (7186563).

21445341 is an equidigital number, since it uses as much as digits as its factorization.

21445341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531.

The product of its digits is 1920, while the sum is 24.

The square root of 21445341 is about 4630.9114653597. The cubic root of 21445341 is about 277.8290488412.

Adding to 21445341 its reverse (14354412), we get a palindrome (35799753).

The spelling of 21445341 in words is "twenty-one million, four hundred forty-five thousand, three hundred forty-one".