121111000221 has 8 divisors (see below), whose sum is σ = 162752840704. Its totient is φ = 80104913280.

The previous prime is 121111000217. The next prime is 121111000237. The reversal of 121111000221 is 122000111121.

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

It is not a de Polignac number, because 121111000221 - 2² = 121111000217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121111000197 and 121111000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111000201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158937940 + ... + 158938701.

It is an arithmetic number, because the mean of its divisors is an integer number (20344105088).

Almost surely, 2^121111000221 is an apocalyptic number.

It is an amenable number.

121111000221 is a deficient number, since it is larger than the sum of its proper divisors (41641840483).

121111000221 is a wasteful number, since it uses less digits than its factorization.

121111000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317876771.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121111000221 its reverse (122000111121), we get a palindrome (243111111342).

The spelling of 121111000221 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.