21404401441 has 8 divisors (see below), whose sum is σ = 21464020224. Its totient is φ = 21344847840.

The previous prime is 21404401433. The next prime is 21404401451. The reversal of 21404401441 is 14410440412.

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 21404401441 - 2³ = 21404401433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404401451) 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, 682536 + ... + 713206.

It is an arithmetic number, because the mean of its divisors is an integer number (2683002528).

Almost surely, 2^21404401441 is an apocalyptic number.

It is an amenable number.

21404401441 is a deficient number, since it is larger than the sum of its proper divisors (59618783).

21404401441 is a wasteful number, since it uses less digits than its factorization.

21404401441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32591.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21404401441 its reverse (14410440412), we get a palindrome (35814841853).

The spelling of 21404401441 in words is "twenty-one billion, four hundred four million, four hundred one thousand, four hundred forty-one".