11201122212121 has 16 divisors (see below), whose sum is σ = 11413955174400. Its totient is φ = 10989069721488.

The previous prime is 11201122212089. The next prime is 11201122212173. The reversal of 11201122212121 is 12121222110211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11201122212121 - 2⁵ = 11201122212089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11201122216121) 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, 92812600 + ... + 92933206.

It is an arithmetic number, because the mean of its divisors is an integer number (713372198400).

Almost surely, 2^{11201122212121} is an apocalyptic number.

It is an amenable number.

11201122212121 is a deficient number, since it is larger than the sum of its proper divisors (212832962279).

11201122212121 is a wasteful number, since it uses less digits than its factorization.

11201122212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123828.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11201122212121 its reverse (12121222110211), we get a palindrome (23322344322332).

The spelling of 11201122212121 in words is "eleven trillion, two hundred one billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".