21342144433 has 8 divisors (see below), whose sum is σ = 21674609280. Its totient is φ = 21011237520.

The previous prime is 21342144389. The next prime is 21342144479. The reversal of 21342144433 is 33444124312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342144433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21342144395 and 21342144404.

It is not an unprimeable number, because it can be changed into a prime (21342144833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361858 + ... + 416683.

It is an arithmetic number, because the mean of its divisors is an integer number (2709326160).

Almost surely, 2^21342144433 is an apocalyptic number.

It is an amenable number.

21342144433 is a deficient number, since it is larger than the sum of its proper divisors (332464847).

21342144433 is an equidigital number, since it uses as much as digits as its factorization.

21342144433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778967.

The product of its digits is 27648, while the sum is 31.

Adding to 21342144433 its reverse (33444124312), we get a palindrome (54786268745).

The spelling of 21342144433 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-four thousand, four hundred thirty-three".