21004522215223 has 8 divisors (see below), whose sum is σ = 21081295798992. Its totient is φ = 20927841975936.

The previous prime is 21004522215221. The next prime is 21004522215247. The reversal of 21004522215223 is 32251222540012.

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 21004522215223 - 2¹ = 21004522215221 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 (21004522215221) 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, 22885240 + ... + 23785357.

It is an arithmetic number, because the mean of its divisors is an integer number (2635161974874).

Almost surely, 2^{21004522215223} is an apocalyptic number.

21004522215223 is a deficient number, since it is larger than the sum of its proper divisors (76773583769).

21004522215223 is a wasteful number, since it uses less digits than its factorization.

21004522215223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46672241.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21004522215223 its reverse (32251222540012), we get a palindrome (53255744755235).

The spelling of 21004522215223 in words is "twenty-one trillion, four billion, five hundred twenty-two million, two hundred fifteen thousand, two hundred twenty-three".