21432221323 has 4 divisors (see below), whose sum is σ = 21888226080. Its totient is φ = 20976216568.

The previous prime is 21432221303. The next prime is 21432221413. The reversal of 21432221323 is 32312223412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21432221323 is a prime.

It is a super-2 number, since 2×21432221323² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432221303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228002308 + ... + 228002401.

It is an arithmetic number, because the mean of its divisors is an integer number (5472056520).

Almost surely, 2^21432221323 is an apocalyptic number.

21432221323 is a deficient number, since it is larger than the sum of its proper divisors (456004757).

21432221323 is an equidigital number, since it uses as much as digits as its factorization.

21432221323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456004756.

The product of its digits is 3456, while the sum is 25.

Adding to 21432221323 its reverse (32312223412), we get a palindrome (53744444735).

The spelling of 21432221323 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-one thousand, three hundred twenty-three".