21220312223 has 8 divisors (see below), whose sum is σ = 23161593600. Its totient is φ = 19281057880.

The previous prime is 21220312189. The next prime is 21220312229. The reversal of 21220312223 is 32221302212.

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 21220312223 - 2²⁴ = 21203535007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220312195 and 21220312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220312229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484823 + ... + 526776.

It is an arithmetic number, because the mean of its divisors is an integer number (2895199200).

Almost surely, 2^21220312223 is an apocalyptic number.

21220312223 is a deficient number, since it is larger than the sum of its proper divisors (1941281377).

21220312223 is a wasteful number, since it uses less digits than its factorization.

21220312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013517.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21220312223 its reverse (32221302212), we get a palindrome (53441614435).

The spelling of 21220312223 in words is "twenty-one billion, two hundred twenty million, three hundred twelve thousand, two hundred twenty-three".