21433003313 has 2 divisors, whose sum is σ = 21433003314. Its totient is φ = 21433003312.

The previous prime is 21433003303. The next prime is 21433003321. The reversal of 21433003313 is 31330033412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18385190464 + 3047812849 = 135592^2 + 55207^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433003313 - 2⁴ = 21433003297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21433003303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716501656 + 10716501657.

It is an arithmetic number, because the mean of its divisors is an integer number (10716501657).

Almost surely, 2^21433003313 is an apocalyptic number.

It is an amenable number.

21433003313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433003313 is an equidigital number, since it uses as much as digits as its factorization.

21433003313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21433003313 its reverse (31330033412), we get a palindrome (52763036725).

The spelling of 21433003313 in words is "twenty-one billion, four hundred thirty-three million, three thousand, three hundred thirteen".