221000002123201 has 16 divisors (see below), whose sum is σ = 265564651004928. Its totient is φ = 179809399083600.

The previous prime is 221000002123189. The next prime is 221000002123211. The reversal of 221000002123201 is 102321200000122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221000002123201 - 2⁵ = 221000002123169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000002123211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5239180515 + ... + 5239222696.

It is an arithmetic number, because the mean of its divisors is an integer number (16597790687808).

Almost surely, 2^{221000002123201} is an apocalyptic number.

It is an amenable number.

221000002123201 is a deficient number, since it is larger than the sum of its proper divisors (44564648881727).

221000002123201 is a wasteful number, since it uses less digits than its factorization.

221000002123201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10478403372.

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

Adding to 221000002123201 its reverse (102321200000122), we get a palindrome (323321202123323).

The spelling of 221000002123201 in words is "two hundred twenty-one trillion, two million, one hundred twenty-three thousand, two hundred one".