221222210021201 has 16 divisors (see below), whose sum is σ = 224272472052816. Its totient is φ = 218189260800000.

The previous prime is 221222210021161. The next prime is 221222210021221. The reversal of 221222210021201 is 102120012222122.

It can be written as a sum of positive squares in 8 ways, for example, as 2966055506176 + 218256154515025 = 1722224^2 + 14773495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221222210021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221222210021221) 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, 97100561 + ... + 99352721.

It is an arithmetic number, because the mean of its divisors is an integer number (14017029503301).

Almost surely, 2^{221222210021201} is an apocalyptic number.

It is an amenable number.

221222210021201 is a deficient number, since it is larger than the sum of its proper divisors (3050262031615).

221222210021201 is a wasteful number, since it uses less digits than its factorization.

221222210021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256004.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221222210021201 its reverse (102120012222122), we get a palindrome (323342222243323).

The spelling of 221222210021201 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty-one thousand, two hundred one".