121102100221 has 4 divisors (see below), whose sum is σ = 121211300700. Its totient is φ = 120992899744.

The previous prime is 121102100219. The next prime is 121102100227. The reversal of 121102100221 is 122001201121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122001201121 = 23539 ⋅5182939.

It can be written as a sum of positive squares in 2 ways, for example, as 27625764100 + 93476336121 = 166210^2 + 305739^2 .

It is a cyclic number.

It is not a de Polignac number, because 121102100221 - 2¹ = 121102100219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121102100227) 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 3 ways as a sum of consecutive naturals, for example, 54598576 + ... + 54600793.

It is an arithmetic number, because the mean of its divisors is an integer number (30302825175).

Almost surely, 2^121102100221 is an apocalyptic number.

It is an amenable number.

121102100221 is a deficient number, since it is larger than the sum of its proper divisors (109200479).

121102100221 is a wasteful number, since it uses less digits than its factorization.

121102100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109200478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121102100221 its reverse (122001201121), we get a palindrome (243103301342).

The spelling of 121102100221 in words is "one hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred twenty-one".