22121201200121 has 16 divisors (see below), whose sum is σ = 23411776671360. Its totient is φ = 20859130427520.

The previous prime is 22121201200117. The next prime is 22121201200141. The reversal of 22121201200121 is 12100210212122.

It is not a de Polignac number, because 22121201200121 - 2² = 22121201200117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22121201200121.

It is not an unprimeable number, because it can be changed into a prime (22121201200141) 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, 11688116 + ... + 13448213.

It is an arithmetic number, because the mean of its divisors is an integer number (1463236041960).

Almost surely, 2^{22121201200121} is an apocalyptic number.

It is an amenable number.

22121201200121 is a deficient number, since it is larger than the sum of its proper divisors (1290575471239).

22121201200121 is a wasteful number, since it uses less digits than its factorization.

22121201200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25136896.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22121201200121 its reverse (12100210212122), we get a palindrome (34221411412243).

The spelling of 22121201200121 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred one million, two hundred thousand, one hundred twenty-one".