21303220320433 has 4 divisors (see below), whose sum is σ = 21303783950400. Its totient is φ = 21302656690468.

The previous prime is 21303220320331. The next prime is 21303220320467. The reversal of 21303220320433 is 33402302230312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21303220320433 - 2²⁹ = 21302683449521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303220323433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281758285 + ... + 281833882.

It is an arithmetic number, because the mean of its divisors is an integer number (5325945987600).

Almost surely, 2^{21303220320433} is an apocalyptic number.

It is an amenable number.

21303220320433 is a deficient number, since it is larger than the sum of its proper divisors (563629967).

21303220320433 is an equidigital number, since it uses as much as digits as its factorization.

21303220320433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563629966.

The product of its (nonzero) digits is 15552, while the sum is 28.

Adding to 21303220320433 its reverse (33402302230312), we get a palindrome (54705522550745).

The spelling of 21303220320433 in words is "twenty-one trillion, three hundred three billion, two hundred twenty million, three hundred twenty thousand, four hundred thirty-three".