21423012322433 has 4 divisors (see below), whose sum is σ = 21511904489988. Its totient is φ = 21334120154880.

The previous prime is 21423012322427. The next prime is 21423012322541. The reversal of 21423012322433 is 33422321032412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9526500769009 + 11896511553424 = 3086503^2 + 3449132^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423012322433 - 2⁴ = 21423012322417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21423012322433.

It is not an unprimeable number, because it can be changed into a prime (21423012322333) 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, 44446083416 + ... + 44446083897.

It is an arithmetic number, because the mean of its divisors is an integer number (5377976122497).

Almost surely, 2^{21423012322433} is an apocalyptic number.

It is an amenable number.

21423012322433 is a deficient number, since it is larger than the sum of its proper divisors (88892167555).

21423012322433 is an equidigital number, since it uses as much as digits as its factorization.

21423012322433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88892167554.

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 21423012322433 its reverse (33422321032412), we get a palindrome (54845333354845).

The spelling of 21423012322433 in words is "twenty-one trillion, four hundred twenty-three billion, twelve million, three hundred twenty-two thousand, four hundred thirty-three".