21404401443 has 16 divisors (see below), whose sum is σ = 32308532640. Its totient is φ = 14000362272.

The previous prime is 21404401433. The next prime is 21404401451. The reversal of 21404401443 is 34410440412.

21404401443 is a `hidden beast` number, since 214 + 0 + 4 + 4 + 0 + 1 + 443 = 666.

It is not a de Polignac number, because 21404401443 - 2¹² = 21404397347 is a prime.

It is a super-2 number, since 2×21404401443² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21404401433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7477396 + ... + 7480257.

It is an arithmetic number, because the mean of its divisors is an integer number (2019283290).

Almost surely, 2^21404401443 is an apocalyptic number.

21404401443 is a deficient number, since it is larger than the sum of its proper divisors (10904131197).

21404401443 is a wasteful number, since it uses less digits than its factorization.

21404401443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14957715 (or 14957709 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21404401443 its reverse (34410440412), we get a palindrome (55814841855).

The spelling of 21404401443 in words is "twenty-one billion, four hundred four million, four hundred one thousand, four hundred forty-three".