21065323 has 6 divisors (see below), whose sum is σ = 21215292. Its totient is φ = 20916360.

The previous prime is 21065287. The next prime is 21065333. The reversal of 21065323 is 32356012.

It is not a de Polignac number, because 21065323 - 2¹³ = 21057131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21065294 and 21065303.

It is not an unprimeable number, because it can be changed into a prime (21065333) 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 5 ways as a sum of consecutive naturals, for example, 32440 + ... + 33082.

It is an arithmetic number, because the mean of its divisors is an integer number (3535882).

Almost surely, 2^21065323 is an apocalyptic number.

21065323 is a deficient number, since it is larger than the sum of its proper divisors (149969).

21065323 is an frugal number, since it uses more digits than its factorization.

21065323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21065323 is about 4589.6974845844. The cubic root of 21065323 is about 276.1781869393.

The spelling of 21065323 in words is "twenty-one million, sixty-five thousand, three hundred twenty-three".