221211001111121 has 32 divisors (see below), whose sum is σ = 264149486665728. Its totient is φ = 181128440148480.

The previous prime is 221211001111117. The next prime is 221211001111129. The reversal of 221211001111121 is 121111100112122.

It is a cyclic number.

It is not a de Polignac number, because 221211001111121 - 2² = 221211001111117 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 221211001111121.

It is not an unprimeable number, because it can be changed into a prime (221211001111129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 453549416 + ... + 454036886.

It is an arithmetic number, because the mean of its divisors is an integer number (8254671458304).

Almost surely, 2^{221211001111121} is an apocalyptic number.

It is an amenable number.

221211001111121 is a deficient number, since it is larger than the sum of its proper divisors (42938485554607).

221211001111121 is a wasteful number, since it uses less digits than its factorization.

221211001111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491181.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 221211001111121 its reverse (121111100112122), we get a palindrome (342322101223243).

The spelling of 221211001111121 in words is "two hundred twenty-one trillion, two hundred eleven billion, one million, one hundred eleven thousand, one hundred twenty-one".