221200002123 has 32 divisors (see below), whose sum is σ = 311663718912. Its totient is φ = 139398969600.

The previous prime is 221200002103. The next prime is 221200002139. The reversal of 221200002123 is 321200002122.

It is a happy number.

It is not a de Polignac number, because 221200002123 - 2²⁶ = 221132893259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221200002103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282690 + ... + 722712.

It is an arithmetic number, because the mean of its divisors is an integer number (9739491216).

Almost surely, 2^221200002123 is an apocalyptic number.

221200002123 is a deficient number, since it is larger than the sum of its proper divisors (90463716789).

221200002123 is a wasteful number, since it uses less digits than its factorization.

221200002123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440195.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 221200002123 its reverse (321200002122), we get a palindrome (542400004245).

Subtracting 221200002123 from its reverse (321200002122), we obtain a palindrome (99999999999).

The spelling of 221200002123 in words is "two hundred twenty-one billion, two hundred million, two thousand, one hundred twenty-three".