21383347 has 2 divisors, whose sum is σ = 21383348. Its totient is φ = 21383346.

The previous prime is 21383321. The next prime is 21383357. The reversal of 21383347 is 74338312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21383347 - 2²³ = 12994739 is a prime.

It is not a weakly prime, because it can be changed into another prime (21383317) 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 as a sum of consecutive naturals, namely, 10691673 + 10691674.

It is an arithmetic number, because the mean of its divisors is an integer number (10691674).

Almost surely, 2^21383347 is an apocalyptic number.

21383347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383347 is an equidigital number, since it uses as much as digits as its factorization.

21383347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 31.

The square root of 21383347 is about 4624.2131222512. The cubic root of 21383347 is about 277.5610752131.

The spelling of 21383347 in words is "twenty-one million, three hundred eighty-three thousand, three hundred forty-seven".