21221243223 has 8 divisors (see below), whose sum is σ = 29207732736. Its totient is φ = 13691124600.

The previous prime is 21221243221. The next prime is 21221243291. The reversal of 21221243223 is 32234212212.

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

It is not a de Polignac number, because 21221243223 - 2¹ = 21221243221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221243193 and 21221243202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221243221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114092613 + ... + 114092798.

It is an arithmetic number, because the mean of its divisors is an integer number (3650966592).

Almost surely, 2^21221243223 is an apocalyptic number.

21221243223 is a deficient number, since it is larger than the sum of its proper divisors (7986489513).

21221243223 is a wasteful number, since it uses less digits than its factorization.

21221243223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228185445.

The product of its digits is 2304, while the sum is 24.

Adding to 21221243223 its reverse (32234212212), we get a palindrome (53455455435).

The spelling of 21221243223 in words is "twenty-one billion, two hundred twenty-one million, two hundred forty-three thousand, two hundred twenty-three".