121303312221 has 16 divisors (see below), whose sum is σ = 199061846144. Its totient is φ = 63984164544.

The previous prime is 121303312183. The next prime is 121303312253. The reversal of 121303312221 is 122213303121.

It is not a de Polignac number, because 121303312221 - 2⁹ = 121303311709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121303312261) 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 15 ways as a sum of consecutive naturals, for example, 222166966 + ... + 222167511.

It is an arithmetic number, because the mean of its divisors is an integer number (12441365384).

Almost surely, 2^121303312221 is an apocalyptic number.

It is an amenable number.

121303312221 is a deficient number, since it is larger than the sum of its proper divisors (77758533923).

121303312221 is a wasteful number, since it uses less digits than its factorization.

121303312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444334500.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121303312221 its reverse (122213303121), we get a palindrome (243516615342).

The spelling of 121303312221 in words is "one hundred twenty-one billion, three hundred three million, three hundred twelve thousand, two hundred twenty-one".