21434233444423 has 2 divisors, whose sum is σ = 21434233444424. Its totient is φ = 21434233444422.

The previous prime is 21434233444369. The next prime is 21434233444447. The reversal of 21434233444423 is 32444433243412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434233444423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21434233444423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434233444453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717116722211 + 10717116722212.

It is an arithmetic number, because the mean of its divisors is an integer number (10717116722212).

Almost surely, 2^{21434233444423} is an apocalyptic number.

21434233444423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434233444423 is an equidigital number, since it uses as much as digits as its factorization.

21434233444423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 43.

Adding to 21434233444423 its reverse (32444433243412), we get a palindrome (53878666687835).

The spelling of 21434233444423 in words is "twenty-one trillion, four hundred thirty-four billion, two hundred thirty-three million, four hundred forty-four thousand, four hundred twenty-three".