21041343 has 32 divisors (see below), whose sum is σ = 33607680. Its totient is φ = 12972960.

The previous prime is 21041309. The next prime is 21041353. The reversal of 21041343 is 34314012.

21041343 is a `hidden beast` number, since 210 + 413 + 43 = 666.

It is not a de Polignac number, because 21041343 - 2¹³ = 21033151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041353) 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 31 ways as a sum of consecutive naturals, for example, 18705 + ... + 19797.

It is an arithmetic number, because the mean of its divisors is an integer number (1050240).

Almost surely, 2^21041343 is an apocalyptic number.

21041343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21041343 is a deficient number, since it is larger than the sum of its proper divisors (12566337).

21041343 is a wasteful number, since it uses less digits than its factorization.

21041343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21041343 is about 4587.0843680927. The cubic root of 21041343 is about 276.0733500699.

Adding to 21041343 its reverse (34314012), we get a palindrome (55355355).

The spelling of 21041343 in words is "twenty-one million, forty-one thousand, three hundred forty-three".