21444321434403 has 96 divisors (see below), whose sum is σ = 34979475456000. Its totient is φ = 11634757505280.

The previous prime is 21444321434377. The next prime is 21444321434411. The reversal of 21444321434403 is 30443412344412.

It is a happy number.

It is not a de Polignac number, because 21444321434403 - 2²¹ = 21444319337251 is a prime.

It is a super-3 number, since 3×21444321434403³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21444321434423) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1861642078 + ... + 1861653596.

It is an arithmetic number, because the mean of its divisors is an integer number (364369536000).

Almost surely, 2^{21444321434403} is an apocalyptic number.

21444321434403 is a deficient number, since it is larger than the sum of its proper divisors (13535154021597).

21444321434403 is a wasteful number, since it uses less digits than its factorization.

21444321434403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18785 (or 18778 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 39.

Adding to 21444321434403 its reverse (30443412344412), we get a palindrome (51887733778815).

The spelling of 21444321434403 in words is "twenty-one trillion, four hundred forty-four billion, three hundred twenty-one million, four hundred thirty-four thousand, four hundred three".