21443022252439 has 8 divisors (see below), whose sum is σ = 21494500651008. Its totient is φ = 21391551848280.

The previous prime is 21443022252413. The next prime is 21443022252461. The reversal of 21443022252439 is 93425222034412.

It is a happy number.

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-21443022252439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21443022252395 and 21443022252404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443022202439) 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 7 ways as a sum of consecutive naturals, for example, 3389754 + ... + 7374040.

It is an arithmetic number, because the mean of its divisors is an integer number (2686812581376).

Almost surely, 2^{21443022252439} is an apocalyptic number.

21443022252439 is a deficient number, since it is larger than the sum of its proper divisors (51478398569).

21443022252439 is a wasteful number, since it uses less digits than its factorization.

21443022252439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997205.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 21443022252439 in words is "twenty-one trillion, four hundred forty-three billion, twenty-two million, two hundred fifty-two thousand, four hundred thirty-nine".