22211201201221 has 4 divisors (see below), whose sum is σ = 22211420969452. Its totient is φ = 22210981432992.

The previous prime is 22211201201209. The next prime is 22211201201257. The reversal of 22211201201221 is 12210210211222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11649838670596 + 10561362530625 = 3413186^2 + 3249825^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211201201221 - 2³³ = 22202611266629 is a prime.

It is a super-2 number, since 2×22211201201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211201201201) 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, 109732446 + ... + 109934671.

It is an arithmetic number, because the mean of its divisors is an integer number (5552855242363).

Almost surely, 2^{22211201201221} is an apocalyptic number.

It is an amenable number.

22211201201221 is a deficient number, since it is larger than the sum of its proper divisors (219768231).

22211201201221 is a wasteful number, since it uses less digits than its factorization.

22211201201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219768230.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22211201201221 its reverse (12210210211222), we get a palindrome (34421411412443).

The spelling of 22211201201221 in words is "twenty-two trillion, two hundred eleven billion, two hundred one million, two hundred one thousand, two hundred twenty-one".