21002323 has 2 divisors, whose sum is σ = 21002324. Its totient is φ = 21002322.

The previous prime is 21002299. The next prime is 21002329. The reversal of 21002323 is 32320012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002323 - 2⁹ = 21001811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501161 + 10501162.

It is an arithmetic number, because the mean of its divisors is an integer number (10501162).

Almost surely, 2^21002323 is an apocalyptic number.

21002323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002323 is an equidigital number, since it uses as much as digits as its factorization.

21002323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21002323 is about 4582.8291480264. The cubic root of 21002323 is about 275.9025902485.

Adding to 21002323 its reverse (32320012), we get a palindrome (53322335).

The spelling of 21002323 in words is "twenty-one million, two thousand, three hundred twenty-three".