21434323 has 2 divisors, whose sum is σ = 21434324. Its totient is φ = 21434322.

The previous prime is 21434293. The next prime is 21434327. The reversal of 21434323 is 32343412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434323 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21434294 and 21434303.

It is not a weakly prime, because it can be changed into another prime (21434327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717161 + 10717162.

It is an arithmetic number, because the mean of its divisors is an integer number (10717162).

Almost surely, 2^21434323 is an apocalyptic number.

21434323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434323 is an equidigital number, since it uses as much as digits as its factorization.

21434323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 22.

The square root of 21434323 is about 4629.7216978993. The cubic root of 21434323 is about 277.7814604964.

Adding to 21434323 its reverse (32343412), we get a palindrome (53777735).

The spelling of 21434323 in words is "twenty-one million, four hundred thirty-four thousand, three hundred twenty-three".