221322220123 has 4 divisors (see below), whose sum is σ = 221335230888. Its totient is φ = 221309209360.

The previous prime is 221322220099. The next prime is 221322220139. The reversal of 221322220123 is 321022223122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221322220123 is a prime.

It is a super-2 number, since 2×221322220123² (a number of 23 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 = 221322220094 and 221322220103.

It is not an unprimeable number, because it can be changed into a prime (221322220153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479833 + ... + 6513898.

It is an arithmetic number, because the mean of its divisors is an integer number (55333807722).

Almost surely, 2^221322220123 is an apocalyptic number.

221322220123 is a deficient number, since it is larger than the sum of its proper divisors (13010765).

221322220123 is a wasteful number, since it uses less digits than its factorization.

221322220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13010764.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 221322220123 its reverse (321022223122), we get a palindrome (542344443245).

The spelling of 221322220123 in words is "two hundred twenty-one billion, three hundred twenty-two million, two hundred twenty thousand, one hundred twenty-three".