21343347 has 24 divisors (see below), whose sum is σ = 32853600. Its totient is φ = 13305600.

The previous prime is 21343337. The next prime is 21343363. The reversal of 21343347 is 74334312.

It is not a de Polignac number, because 21343347 - 2⁴ = 21343331 is a prime.

It is a super-2 number, since 2×21343347² = 911076922324818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21343347.

It is not an unprimeable number, because it can be changed into a prime (21343307) 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 23 ways as a sum of consecutive naturals, for example, 30097 + ... + 30797.

It is an arithmetic number, because the mean of its divisors is an integer number (1368900).

Almost surely, 2^21343347 is an apocalyptic number.

21343347 is a deficient number, since it is larger than the sum of its proper divisors (11510253).

21343347 is a wasteful number, since it uses less digits than its factorization.

21343347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923 (or 920 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 21343347 is about 4619.8860375555. The cubic root of 21343347 is about 277.3878972567.

Adding to 21343347 its reverse (74334312), we get a palindrome (95677659).

The spelling of 21343347 in words is "twenty-one million, three hundred forty-three thousand, three hundred forty-seven".