121221231321 has 8 divisors (see below), whose sum is σ = 161711160064. Its totient is φ = 80772728400.

The previous prime is 121221231289. The next prime is 121221231343. The reversal of 121221231321 is 123132122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221231321 - 2⁵ = 121221231289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221230321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10349626 + ... + 10361331.

It is an arithmetic number, because the mean of its divisors is an integer number (20213895008).

Almost surely, 2^121221231321 is an apocalyptic number.

It is an amenable number.

121221231321 is a deficient number, since it is larger than the sum of its proper divisors (40489928743).

121221231321 is a wasteful number, since it uses less digits than its factorization.

121221231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20712911.

The product of its digits is 288, while the sum is 21.

Adding to 121221231321 its reverse (123132122121), we get a palindrome (244353353442).

The spelling of 121221231321 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, three hundred twenty-one".