21201022223 has 16 divisors (see below), whose sum is σ = 21887749632. Its totient is φ = 20522808000.

The previous prime is 21201022147. The next prime is 21201022229. The reversal of 21201022223 is 32222010212.

It is a cyclic number.

It is not a de Polignac number, because 21201022223 - 2¹² = 21201018127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022229) 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 15 ways as a sum of consecutive naturals, for example, 4615658 + ... + 4620248.

It is an arithmetic number, because the mean of its divisors is an integer number (1367984352).

Almost surely, 2^21201022223 is an apocalyptic number.

21201022223 is a deficient number, since it is larger than the sum of its proper divisors (686727409).

21201022223 is a wasteful number, since it uses less digits than its factorization.

21201022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5486.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21201022223 its reverse (32222010212), we get a palindrome (53423032435).

The spelling of 21201022223 in words is "twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty-three".