21122122223 has 8 divisors (see below), whose sum is σ = 21342064656. Its totient is φ = 20902392000.

The previous prime is 21122122193. The next prime is 21122122237. The reversal of 21122122223 is 32222122112.

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 21122122223 - 2⁶ = 21122122159 is a prime.

It is a super-2 number, since 2×21122122223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122122195 and 21122122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122122123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151115 + ... + 255107.

It is an arithmetic number, because the mean of its divisors is an integer number (2667758082).

Almost surely, 2^21122122223 is an apocalyptic number.

21122122223 is a deficient number, since it is larger than the sum of its proper divisors (219942433).

21122122223 is a wasteful number, since it uses less digits than its factorization.

21122122223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106105.

The product of its digits is 384, while the sum is 20.

Adding to 21122122223 its reverse (32222122112), we get a palindrome (53344244335).

The spelling of 21122122223 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-three".