21443441231 has 8 divisors (see below), whose sum is σ = 21577867584. Its totient is φ = 21309190560.

The previous prime is 21443441183. The next prime is 21443441267. The reversal of 21443441231 is 13214434412.

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

It is a cyclic number.

It is not a de Polignac number, because 21443441231 - 2³⁰ = 20369699407 is a prime.

It is a super-2 number, since 2×21443441231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21443441194 and 21443441203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443441431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205370 + ... + 291656.

It is an arithmetic number, because the mean of its divisors is an integer number (2697233448).

Almost surely, 2^21443441231 is an apocalyptic number.

21443441231 is a deficient number, since it is larger than the sum of its proper divisors (134426353).

21443441231 is a wasteful number, since it uses less digits than its factorization.

21443441231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87841.

The product of its digits is 9216, while the sum is 29.

Adding to 21443441231 its reverse (13214434412), we get a palindrome (34657875643).

The spelling of 21443441231 in words is "twenty-one billion, four hundred forty-three million, four hundred forty-one thousand, two hundred thirty-one".