22201001201221 has 4 divisors (see below), whose sum is σ = 22202473724172. Its totient is φ = 22199528678272.

The previous prime is 22201001201123. The next prime is 22201001201237. The reversal of 22201001201221 is 12210210010222.

It is a happy number.

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 9211140020196 + 12989861181025 = 3034986^2 + 3604145^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201001201221 - 2⁹ = 22201001200709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22201001201195 and 22201001201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201001201321) 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, 736238860 + ... + 736269013.

It is an arithmetic number, because the mean of its divisors is an integer number (5550618431043).

Almost surely, 2^{22201001201221} is an apocalyptic number.

It is an amenable number.

22201001201221 is a deficient number, since it is larger than the sum of its proper divisors (1472522951).

22201001201221 is a wasteful number, since it uses less digits than its factorization.

22201001201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472522950.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22201001201221 its reverse (12210210010222), we get a palindrome (34411211211443).

The spelling of 22201001201221 in words is "twenty-two trillion, two hundred one billion, one million, two hundred one thousand, two hundred twenty-one".