11111220101221 has 8 divisors (see below), whose sum is σ = 11699258436320. Its totient is φ = 10523505493872.

The previous prime is 11111220101209. The next prime is 11111220101237. The reversal of 11111220101221 is 12210102211111.

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 11111220101221 - 2³⁵ = 11076860362853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111220101195 and 11111220101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111220104221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80861475 + ... + 80998768.

It is an arithmetic number, because the mean of its divisors is an integer number (1462407304540).

Almost surely, 2^{11111220101221} is an apocalyptic number.

It is an amenable number.

11111220101221 is a deficient number, since it is larger than the sum of its proper divisors (588038335099).

11111220101221 is a wasteful number, since it uses less digits than its factorization.

11111220101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161863875.

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

Adding to 11111220101221 its reverse (12210102211111), we get a palindrome (23321322312332).

The spelling of 11111220101221 in words is "eleven trillion, one hundred eleven billion, two hundred twenty million, one hundred one thousand, two hundred twenty-one".