21521413005223 has 8 divisors (see below), whose sum is σ = 21773078543216. Its totient is φ = 21271206398400.

The previous prime is 21521413005193. The next prime is 21521413005241. The reversal of 21521413005223 is 32250031412512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21521413005223 - 2¹⁷ = 21521412874151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521413000223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364703118 + ... + 364762123.

It is an arithmetic number, because the mean of its divisors is an integer number (2721634817902).

Almost surely, 2^{21521413005223} is an apocalyptic number.

21521413005223 is a deficient number, since it is larger than the sum of its proper divisors (251665537993).

21521413005223 is a wasteful number, since it uses less digits than its factorization.

21521413005223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729465585.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21521413005223 its reverse (32250031412512), we get a palindrome (53771444417735).

The spelling of 21521413005223 in words is "twenty-one trillion, five hundred twenty-one billion, four hundred thirteen million, five thousand, two hundred twenty-three".