121201111011221 has 8 divisors (see below), whose sum is σ = 126471876375744. Its totient is φ = 115930441633600.

The previous prime is 121201111011191. The next prime is 121201111011241. The reversal of 121201111011221 is 122110111102121.

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 121201111011221 - 2⁶ = 121201111011157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121201111011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201111011241) 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, 21410516 + ... + 26472861.

It is an arithmetic number, because the mean of its divisors is an integer number (15808984546968).

Almost surely, 2^{121201111011221} is an apocalyptic number.

It is an amenable number.

121201111011221 is a deficient number, since it is larger than the sum of its proper divisors (5270765364523).

121201111011221 is a wasteful number, since it uses less digits than its factorization.

121201111011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47993451.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 121201111011221 its reverse (122110111102121), we get a palindrome (243311222113342).

The spelling of 121201111011221 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred eleven million, eleven thousand, two hundred twenty-one".