11100212220221 has 8 divisors (see below), whose sum is σ = 11755802973240. Its totient is φ = 10444914477568.

The previous prime is 11100212220217. The next prime is 11100212220259. The reversal of 11100212220221 is 12202221200111.

It can be written as a sum of positive squares in 4 ways, for example, as 1595014917721 + 9505197302500 = 1262939^2 + 3083050^2 .

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 11100212220221 - 2² = 11100212220217 is a prime.

It is a super-3 number, since 3×11100212220221³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 11100212220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100212220121) 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, 73174586 + ... + 73326123.

It is an arithmetic number, because the mean of its divisors is an integer number (1469475371655).

Almost surely, 2^{11100212220221} is an apocalyptic number.

It is an amenable number.

11100212220221 is a deficient number, since it is larger than the sum of its proper divisors (655590753019).

11100212220221 is a wasteful number, since it uses less digits than its factorization.

11100212220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146505183.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11100212220221 its reverse (12202221200111), we get a palindrome (23302433420332).

The spelling of 11100212220221 in words is "eleven trillion, one hundred billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".