21444041403 has 12 divisors (see below), whose sum is σ = 30979832520. Its totient is φ = 14293670976.

The previous prime is 21444041363. The next prime is 21444041413. The reversal of 21444041403 is 30414044412.

21444041403 is a `hidden beast` number, since 214 + 4 + 4 + 0 + 41 + 403 = 666.

It is not a de Polignac number, because 21444041403 - 2¹⁷ = 21443910331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444041413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137838 + ... + 248771.

It is an arithmetic number, because the mean of its divisors is an integer number (2581652710).

Almost surely, 2^21444041403 is an apocalyptic number.

21444041403 is a deficient number, since it is larger than the sum of its proper divisors (9535791117).

21444041403 is a wasteful number, since it uses less digits than its factorization.

21444041403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392778 (or 392775 counting only the distinct ones).

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

Adding to 21444041403 its reverse (30414044412), we get a palindrome (51858085815).

The spelling of 21444041403 in words is "twenty-one billion, four hundred forty-four million, forty-one thousand, four hundred three".