21044042213005 has 48 divisors (see below), whose sum is σ = 30061236832704. Its totient is φ = 14093529085440.

The previous prime is 21044042212987. The next prime is 21044042213069. The reversal of 21044042213005 is 50031224044012.

It is not a de Polignac number, because 21044042213005 - 2²⁷ = 21043907995277 is a prime.

It is a super-2 number, since 2×21044042213005² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150801994 + ... + 150941476.

It is an arithmetic number, because the mean of its divisors is an integer number (626275767348).

Almost surely, 2^{21044042213005} is an apocalyptic number.

It is an amenable number.

21044042213005 is a deficient number, since it is larger than the sum of its proper divisors (9017194619699).

21044042213005 is a wasteful number, since it uses less digits than its factorization.

21044042213005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153866 (or 153859 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21044042213005 its reverse (50031224044012), we get a palindrome (71075266257017).

The spelling of 21044042213005 in words is "twenty-one trillion, forty-four billion, forty-two million, two hundred thirteen thousand, five".