121221311113 has 4 divisors (see below), whose sum is σ = 138538641280. Its totient is φ = 103903980948.

The previous prime is 121221311111. The next prime is 121221311117. The reversal of 121221311113 is 311113122121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 311113122121 = 127 ⋅2449709623.

It is a cyclic number.

It is not a de Polignac number, because 121221311113 - 2¹ = 121221311111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221311111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8658665073 + ... + 8658665086.

It is an arithmetic number, because the mean of its divisors is an integer number (34634660320).

Almost surely, 2^121221311113 is an apocalyptic number.

It is an amenable number.

121221311113 is a deficient number, since it is larger than the sum of its proper divisors (17317330167).

121221311113 is an equidigital number, since it uses as much as digits as its factorization.

121221311113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317330166.

The product of its digits is 72, while the sum is 19.

Adding to 121221311113 its reverse (311113122121), we get a palindrome (432334433234).

The spelling of 121221311113 in words is "one hundred twenty-one billion, two hundred twenty-one million, three hundred eleven thousand, one hundred thirteen".