221111121200001 has 16 divisors (see below), whose sum is σ = 310334105605440. Its totient is φ = 139647910835520.

The previous prime is 221111121199919. The next prime is 221111121200017. The reversal of 221111121200001 is 100002121111122.

It is a happy number.

It is not a de Polignac number, because 221111121200001 - 2²² = 221111117005697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111121201001) 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, 10308190 + ... + 23419671.

It is an arithmetic number, because the mean of its divisors is an integer number (19395881600340).

Almost surely, 2^{221111121200001} is an apocalyptic number.

It is an amenable number.

221111121200001 is a deficient number, since it is larger than the sum of its proper divisors (89222984405439).

221111121200001 is a wasteful number, since it uses less digits than its factorization.

221111121200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33842896.

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

Adding to 221111121200001 its reverse (100002121111122), we get a palindrome (321113242311123).

The spelling of 221111121200001 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred thousand, one".