21011022223 has 8 divisors (see below), whose sum is σ = 21222727920. Its totient is φ = 20799388800.

The previous prime is 21011022217. The next prime is 21011022233. The reversal of 21011022223 is 32222011012.

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 21011022223 - 2⁹ = 21011021711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011022197 and 21011022206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011022233) 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, 714711 + ... + 743527.

It is an arithmetic number, because the mean of its divisors is an integer number (2652840990).

Almost surely, 2^21011022223 is an apocalyptic number.

21011022223 is a deficient number, since it is larger than the sum of its proper divisors (211705697).

21011022223 is a wasteful number, since it uses less digits than its factorization.

21011022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36137.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21011022223 its reverse (32222011012), we get a palindrome (53233033235).

The spelling of 21011022223 in words is "twenty-one billion, eleven million, twenty-two thousand, two hundred twenty-three".