21043205224045 has 16 divisors (see below), whose sum is σ = 26583126488640. Its totient is φ = 15947193078144.

The previous prime is 21043205224039. The next prime is 21043205224061. The reversal of 21043205224045 is 54042250234012.

It is a cyclic number.

It is not a de Polignac number, because 21043205224045 - 2²⁷ = 21043071006317 is a prime.

It is a super-2 number, since 2×21043205224045² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21043205224045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8179167 + ... + 10439596.

It is an arithmetic number, because the mean of its divisors is an integer number (1661445405540).

Almost surely, 2^{21043205224045} is an apocalyptic number.

It is an amenable number.

21043205224045 is a deficient number, since it is larger than the sum of its proper divisors (5539921264595).

21043205224045 is a wasteful number, since it uses less digits than its factorization.

21043205224045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18630684.

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 21043205224045 its reverse (54042250234012), we get a palindrome (75085455458057).

The spelling of 21043205224045 in words is "twenty-one trillion, forty-three billion, two hundred five million, two hundred twenty-four thousand, forty-five".