21000323 has 8 divisors (see below), whose sum is σ = 21588336. Its totient is φ = 20416000.

The previous prime is 21000313. The next prime is 21000337. The reversal of 21000323 is 32300012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000323 - 2⁴ = 21000307 is a prime.

It is a super-2 number, since 2×21000323² = 882027132208658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13748 + ... + 15198.

It is an arithmetic number, because the mean of its divisors is an integer number (2698542).

Almost surely, 2^21000323 is an apocalyptic number.

21000323 is a deficient number, since it is larger than the sum of its proper divisors (588013).

21000323 is a wasteful number, since it uses less digits than its factorization.

21000323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21000323 is about 4582.6109370096. The cubic root of 21000323 is about 275.8938321269.

Adding to 21000323 its reverse (32300012), we get a palindrome (53300335).

The spelling of 21000323 in words is "twenty-one million, three hundred twenty-three", and thus it is an aban number.