121603221 has 32 divisors (see below), whose sum is σ = 183456000. Its totient is φ = 79600320.

The previous prime is 121603187. The next prime is 121603259. The reversal of 121603221 is 122306121.

It is not a de Polignac number, because 121603221 - 2⁹ = 121602709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121603194 and 121603203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121603271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671751 + ... + 671931.

It is an arithmetic number, because the mean of its divisors is an integer number (5733000).

Almost surely, 2^121603221 is an apocalyptic number.

It is an amenable number.

121603221 is a deficient number, since it is larger than the sum of its proper divisors (61852779).

121603221 is a wasteful number, since it uses less digits than its factorization.

121603221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121603221 is about 11027.3850481426. The cubic root of 121603221 is about 495.4293061657.

Adding to 121603221 its reverse (122306121), we get a palindrome (243909342).

The spelling of 121603221 in words is "one hundred twenty-one million, six hundred three thousand, two hundred twenty-one".