11101221200121 has 12 divisors (see below), whose sum is σ = 16027798656528. Its totient is φ = 6831520738224.

The previous prime is 11101221200099. The next prime is 11101221200123. The reversal of 11101221200121 is 12100212210111.

It is a happy number.

It is not a de Polignac number, because 11101221200121 - 2¹⁴ = 11101221183737 is a prime.

It is a super-2 number, since 2×11101221200121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11101221200121.

It is not an unprimeable number, because it can be changed into a prime (11101221200123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10947949395 + ... + 10947950408.

It is an arithmetic number, because the mean of its divisors is an integer number (1335649888044).

Almost surely, 2^{11101221200121} is an apocalyptic number.

It is an amenable number.

11101221200121 is a deficient number, since it is larger than the sum of its proper divisors (4926577456407).

11101221200121 is a wasteful number, since it uses less digits than its factorization.

11101221200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21895899832 (or 21895899819 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11101221200121 its reverse (12100212210111), we get a palindrome (23201433410232).

The spelling of 11101221200121 in words is "eleven trillion, one hundred one billion, two hundred twenty-one million, two hundred thousand, one hundred twenty-one".