11111201211221 has 8 divisors (see below), whose sum is σ = 11170448239104. Its totient is φ = 11051965362880.

The previous prime is 11111201211217. The next prime is 11111201211247. The reversal of 11111201211221 is 12211210211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111201211221 - 2² = 11111201211217 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 11111201211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111201211521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798020 + ... + 4781133.

It is an arithmetic number, because the mean of its divisors is an integer number (1396306029888).

Almost surely, 2^{11111201211221} is an apocalyptic number.

It is an amenable number.

11111201211221 is a deficient number, since it is larger than the sum of its proper divisors (59247027883).

11111201211221 is a wasteful number, since it uses less digits than its factorization.

11111201211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5589771.

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

Adding to 11111201211221 its reverse (12211210211111), we get a palindrome (23322411422332).

The spelling of 11111201211221 in words is "eleven trillion, one hundred eleven billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".