21122200123 has 8 divisors (see below), whose sum is σ = 21173391360. Its totient is φ = 21071068200.

The previous prime is 21122200109. The next prime is 21122200129. The reversal of 21122200123 is 32100222112.

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 21122200123 - 2⁹ = 21122199611 is a prime.

It is a super-2 number, since 2×21122200123² (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 = 21122200097 and 21122200106.

It is not an unprimeable number, because it can be changed into a prime (21122200129) 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, 744586 + ... + 772432.

It is an arithmetic number, because the mean of its divisors is an integer number (2646673920).

Almost surely, 2^21122200123 is an apocalyptic number.

21122200123 is a deficient number, since it is larger than the sum of its proper divisors (51191237).

21122200123 is a wasteful number, since it uses less digits than its factorization.

21122200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29657.

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

Adding to 21122200123 its reverse (32100222112), we get a palindrome (53222422235).

The spelling of 21122200123 in words is "twenty-one billion, one hundred twenty-two million, two hundred thousand, one hundred twenty-three".