121221011313 has 24 divisors (see below), whose sum is σ = 189294081600. Its totient is φ = 74491428384.

The previous prime is 121221011297. The next prime is 121221011357. The reversal of 121221011313 is 313110122121.

121221011313 is a `hidden beast` number, since 121 + 221 + 0 + 11 + 313 = 666.

It is not a de Polignac number, because 121221011313 - 2⁴ = 121221011297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221011363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9573333 + ... + 9585986.

It is an arithmetic number, because the mean of its divisors is an integer number (7887253400).

Almost surely, 2^121221011313 is an apocalyptic number.

It is an amenable number.

121221011313 is a deficient number, since it is larger than the sum of its proper divisors (68073070287).

121221011313 is a wasteful number, since it uses less digits than its factorization.

121221011313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19159381 (or 19159378 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121221011313 its reverse (313110122121), we get a palindrome (434331133434).

The spelling of 121221011313 in words is "one hundred twenty-one billion, two hundred twenty-one million, eleven thousand, three hundred thirteen".