221121222201 has 24 divisors (see below), whose sum is σ = 348462485280. Its totient is φ = 134001691200.

The previous prime is 221121222173. The next prime is 221121222221. The reversal of 221121222201 is 102222121122.

It is a happy number.

221121222201 is a `hidden beast` number, since 221 + 1 + 21 + 222 + 201 = 666.

It is not a de Polignac number, because 221121222201 - 2⁵ = 221121222169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121222221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1189366 + ... + 1362656.

It is an arithmetic number, because the mean of its divisors is an integer number (14519270220).

Almost surely, 2^221121222201 is an apocalyptic number.

It is an amenable number.

221121222201 is a deficient number, since it is larger than the sum of its proper divisors (127341263079).

221121222201 is a wasteful number, since it uses less digits than its factorization.

221121222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186197 (or 186194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221121222201 its reverse (102222121122), we get a palindrome (323343343323).

The spelling of 221121222201 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred one".