21041347 has 8 divisors (see below), whose sum is σ = 21703680. Its totient is φ = 20389320.

The previous prime is 21041309. The next prime is 21041353. The reversal of 21041347 is 74314012.

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 21041347 - 2¹⁵ = 21008579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041357) 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, 1678 + ... + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (2712960).

Almost surely, 2^21041347 is an apocalyptic number.

21041347 is a deficient number, since it is larger than the sum of its proper divisors (662333).

21041347 is an equidigital number, since it uses as much as digits as its factorization.

21041347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21041347 is about 4587.0848040994. The cubic root of 21041347 is about 276.0733675639.

Adding to 21041347 its reverse (74314012), we get a palindrome (95355359).

The spelling of 21041347 in words is "twenty-one million, forty-one thousand, three hundred forty-seven".