21221314223 has 4 divisors (see below), whose sum is σ = 21275868120. Its totient is φ = 21166760328.

The previous prime is 21221314193. The next prime is 21221314229. The reversal of 21221314223 is 32241312212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221314223 - 2¹⁶ = 21221248687 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 (21221314229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27276365 + ... + 27277142.

It is an arithmetic number, because the mean of its divisors is an integer number (5318967030).

Almost surely, 2^21221314223 is an apocalyptic number.

21221314223 is a deficient number, since it is larger than the sum of its proper divisors (54553897).

21221314223 is an equidigital number, since it uses as much as digits as its factorization.

21221314223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54553896.

The product of its digits is 1152, while the sum is 23.

Adding to 21221314223 its reverse (32241312212), we get a palindrome (53462626435).

The spelling of 21221314223 in words is "twenty-one billion, two hundred twenty-one million, three hundred fourteen thousand, two hundred twenty-three".