21165383 has 2 divisors, whose sum is σ = 21165384. Its totient is φ = 21165382.

The previous prime is 21165379. The next prime is 21165409. The reversal of 21165383 is 38356112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21165383 - 2² = 21165379 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21165583) 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 as a sum of consecutive naturals, namely, 10582691 + 10582692.

It is an arithmetic number, because the mean of its divisors is an integer number (10582692).

Almost surely, 2^21165383 is an apocalyptic number.

21165383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21165383 is an equidigital number, since it uses as much as digits as its factorization.

21165383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 21165383 is about 4600.5850714882. The cubic root of 21165383 is about 276.6147772882.

The spelling of 21165383 in words is "twenty-one million, one hundred sixty-five thousand, three hundred eighty-three".