21334347 has 10 divisors (see below), whose sum is σ = 31869948. Its totient is φ = 14222844.

The previous prime is 21334333. The next prime is 21334373. The reversal of 21334347 is 74343312.

It is not a de Polignac number, because 21334347 - 2⁷ = 21334219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21334347.

It is not an unprimeable number, because it can be changed into a prime (21334387) 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 9 ways as a sum of consecutive naturals, for example, 131613 + ... + 131774.

Almost surely, 2^21334347 is an apocalyptic number.

21334347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21334347 is a deficient number, since it is larger than the sum of its proper divisors (10535601).

21334347 is an equidigital number, since it uses as much as digits as its factorization.

21334347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263399 (or 263390 counting only the distinct ones).

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

The square root of 21334347 is about 4618.9118848491. The cubic root of 21334347 is about 277.3489024033.

Adding to 21334347 its reverse (74343312), we get a palindrome (95677659).

The spelling of 21334347 in words is "twenty-one million, three hundred thirty-four thousand, three hundred forty-seven".