121220133221 has 4 divisors (see below), whose sum is σ = 132240145344. Its totient is φ = 110200121100.

The previous prime is 121220133217. The next prime is 121220133227. The reversal of 121220133221 is 122331022121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121220133221 - 2² = 121220133217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121220133193 and 121220133202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220133227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510006045 + ... + 5510006066.

It is an arithmetic number, because the mean of its divisors is an integer number (33060036336).

Almost surely, 2^121220133221 is an apocalyptic number.

121220133221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220133221 is a deficient number, since it is larger than the sum of its proper divisors (11020012123).

121220133221 is a wasteful number, since it uses less digits than its factorization.

121220133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020012122.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 121220133221 its reverse (122331022121), we get a palindrome (243551155342).

Subtracting 121220133221 from its reverse (122331022121), we obtain a square (1110888900 = 33330²).

The spelling of 121220133221 in words is "one hundred twenty-one billion, two hundred twenty million, one hundred thirty-three thousand, two hundred twenty-one".