121201221 has 8 divisors (see below), whose sum is σ = 161665920. Its totient is φ = 80768672.

The previous prime is 121201217. The next prime is 121201229. The reversal of 121201221 is 122102121.

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 121201221 - 2² = 121201217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201197 and 121201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2881 + ... + 15833.

It is an arithmetic number, because the mean of its divisors is an integer number (20208240).

Almost surely, 2^121201221 is an apocalyptic number.

It is an amenable number.

121201221 is a deficient number, since it is larger than the sum of its proper divisors (40464699).

121201221 is a wasteful number, since it uses less digits than its factorization.

121201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16075.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121201221 is about 11009.1426096677. The cubic root of 121201221 is about 494.8827678709.

Adding to 121201221 its reverse (122102121), we get a palindrome (243303342).

The spelling of 121201221 in words is "one hundred twenty-one million, two hundred one thousand, two hundred twenty-one".