121113213221 has 80 divisors (see below), whose sum is σ = 167032817280. Its totient is φ = 86568370560.

The previous prime is 121113213191. The next prime is 121113213229. The reversal of 121113213221 is 122312311121.

It is not a de Polignac number, because 121113213221 - 2⁶ = 121113213157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121113213193 and 121113213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121113213229) 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 79 ways as a sum of consecutive naturals, for example, 59397320 + ... + 59399358.

It is an arithmetic number, because the mean of its divisors is an integer number (2087910216).

Almost surely, 2^121113213221 is an apocalyptic number.

121113213221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121113213221 is a deficient number, since it is larger than the sum of its proper divisors (45919604059).

121113213221 is a wasteful number, since it uses less digits than its factorization.

121113213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2243 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

Adding to 121113213221 its reverse (122312311121), we get a palindrome (243425524342).

The spelling of 121113213221 in words is "one hundred twenty-one billion, one hundred thirteen million, two hundred thirteen thousand, two hundred twenty-one".