16421323 has 2 divisors, whose sum is σ = 16421324. Its totient is φ = 16421322.

The previous prime is 16421299. The next prime is 16421341. The reversal of 16421323 is 32312461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16421294 and 16421303.

It is not a weakly prime, because it can be changed into another prime (16421023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210661 + 8210662.

It is an arithmetic number, because the mean of its divisors is an integer number (8210662).

Almost surely, 2^16421323 is an apocalyptic number.

16421323 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421323 is an equidigital number, since it uses as much as digits as its factorization.

16421323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 16421323 is about 4052.3231608548. The cubic root of 16421323 is about 254.1768819807.

Adding to 16421323 its reverse (32312461), we get a palindrome (48733784).

The spelling of 16421323 in words is "sixteen million, four hundred twenty-one thousand, three hundred twenty-three".