21023323 has 2 divisors, whose sum is σ = 21023324. Its totient is φ = 21023322.

The previous prime is 21023309. The next prime is 21023341. The reversal of 21023323 is 32332012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023323 - 2⁹ = 21022811 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023297 and 21023306.

It is not a weakly prime, because it can be changed into another prime (21023383) 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, 10511661 + 10511662.

It is an arithmetic number, because the mean of its divisors is an integer number (10511662).

Almost surely, 2^21023323 is an apocalyptic number.

21023323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023323 is an equidigital number, since it uses as much as digits as its factorization.

21023323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21023323 is about 4585.1197367135. The cubic root of 21023323 is about 275.9945169743.

Adding to 21023323 its reverse (32332012), we get a palindrome (53355335).

The spelling of 21023323 in words is "twenty-one million, twenty-three thousand, three hundred twenty-three".