21104244123413 has 16 divisors (see below), whose sum is σ = 23348044212480. Its totient is φ = 18916239048000.

The previous prime is 21104244123379. The next prime is 21104244123439. The reversal of 21104244123413 is 31432144240112.

It is a cyclic number.

It is not a de Polignac number, because 21104244123413 - 2¹⁸ = 21104243861269 is a prime.

It is a super-2 number, since 2×21104244123413² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21104244123413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104244023413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39474470 + ... + 40005527.

It is an arithmetic number, because the mean of its divisors is an integer number (1459252763280).

Almost surely, 2^{21104244123413} is an apocalyptic number.

It is an amenable number.

21104244123413 is a deficient number, since it is larger than the sum of its proper divisors (2243800089067).

21104244123413 is a wasteful number, since it uses less digits than its factorization.

21104244123413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79480348.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 21104244123413 its reverse (31432144240112), we get a palindrome (52536388363525).

The spelling of 21104244123413 in words is "twenty-one trillion, one hundred four billion, two hundred forty-four million, one hundred twenty-three thousand, four hundred thirteen".