21344234473 has 2 divisors, whose sum is σ = 21344234474. Its totient is φ = 21344234472.

The previous prime is 21344234441. The next prime is 21344234477. The reversal of 21344234473 is 37443244312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11145658329 + 10198576144 = 105573^2 + 100988^2 .

It is a cyclic number.

It is not a de Polignac number, because 21344234473 - 2⁵ = 21344234441 is a prime.

It is not a weakly prime, because it can be changed into another prime (21344234477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672117236 + 10672117237.

It is an arithmetic number, because the mean of its divisors is an integer number (10672117237).

Almost surely, 2^21344234473 is an apocalyptic number.

It is an amenable number.

21344234473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344234473 is an equidigital number, since it uses as much as digits as its factorization.

21344234473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 37.

Adding to 21344234473 its reverse (37443244312), we get a palindrome (58787478785).

The spelling of 21344234473 in words is "twenty-one billion, three hundred forty-four million, two hundred thirty-four thousand, four hundred seventy-three".