21143221223 has 4 divisors (see below), whose sum is σ = 22256022360. Its totient is φ = 20030420088.

The previous prime is 21143221171. The next prime is 21143221277. The reversal of 21143221223 is 32212234112.

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 21143221223 - 2¹² = 21143217127 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 (21146221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556400540 + ... + 556400577.

It is an arithmetic number, because the mean of its divisors is an integer number (5564005590).

Almost surely, 2^21143221223 is an apocalyptic number.

21143221223 is a deficient number, since it is larger than the sum of its proper divisors (1112801137).

21143221223 is a wasteful number, since it uses less digits than its factorization.

21143221223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112801136.

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

Adding to 21143221223 its reverse (32212234112), we get a palindrome (53355455335).

The spelling of 21143221223 in words is "twenty-one billion, one hundred forty-three million, two hundred twenty-one thousand, two hundred twenty-three".