11221100121221 has 8 divisors (see below), whose sum is σ = 11889514237824. Its totient is φ = 10553613716160.

The previous prime is 11221100121211. The next prime is 11221100121269. The reversal of 11221100121221 is 12212100112211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221100121221 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11221100121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221100121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231902975 + ... + 231951356.

It is an arithmetic number, because the mean of its divisors is an integer number (1486189279728).

Almost surely, 2^{11221100121221} is an apocalyptic number.

It is an amenable number.

11221100121221 is a deficient number, since it is larger than the sum of its proper divisors (668414116603).

11221100121221 is a wasteful number, since it uses less digits than its factorization.

11221100121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463855771.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11221100121221 its reverse (12212100112211), we get a palindrome (23433200233432).

The spelling of 11221100121221 in words is "eleven trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".