21440321443 has 8 divisors (see below), whose sum is σ = 22816756512. Its totient is φ = 20076690816.

The previous prime is 21440321437. The next prime is 21440321467. The reversal of 21440321443 is 34412304412.

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 21440321443 - 2¹⁷ = 21440190371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440321423) 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, 3197655 + ... + 3204352.

It is an arithmetic number, because the mean of its divisors is an integer number (2852094564).

Almost surely, 2^21440321443 is an apocalyptic number.

21440321443 is a deficient number, since it is larger than the sum of its proper divisors (1376435069).

21440321443 is a wasteful number, since it uses less digits than its factorization.

21440321443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402221.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21440321443 its reverse (34412304412), we get a palindrome (55852625855).

The spelling of 21440321443 in words is "twenty-one billion, four hundred forty million, three hundred twenty-one thousand, four hundred forty-three".