21444232401 has 24 divisors (see below), whose sum is σ = 31118264424. Its totient is φ = 14230118400.

The previous prime is 21444232387. The next prime is 21444232421. The reversal of 21444232401 is 10423244412.

21444232401 is a `hidden beast` number, since 21 + 4 + 4 + 4 + 232 + 401 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2674958400 + 18769274001 = 51720^2 + 137001^2 .

It is not a de Polignac number, because 21444232401 - 2¹⁹ = 21443708113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444232421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4394575 + ... + 4399451.

It is an arithmetic number, because the mean of its divisors is an integer number (1296594351).

Almost surely, 2^21444232401 is an apocalyptic number.

It is an amenable number.

21444232401 is a deficient number, since it is larger than the sum of its proper divisors (9674032023).

21444232401 is a wasteful number, since it uses less digits than its factorization.

21444232401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041 (or 7038 counting only the distinct ones).

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

Adding to 21444232401 its reverse (10423244412), we get a palindrome (31867476813).

The spelling of 21444232401 in words is "twenty-one billion, four hundred forty-four million, two hundred thirty-two thousand, four hundred one".