121211223313 has 4 divisors (see below), whose sum is σ = 121212211428. Its totient is φ = 121210235200.

The previous prime is 121211223299. The next prime is 121211223317. The reversal of 121211223313 is 313322112121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 33246781569 + 87964441744 = 182337^2 + 296588^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211223313 - 2¹⁷ = 121211092241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211223317) 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, 278788 + ... + 565813.

It is an arithmetic number, because the mean of its divisors is an integer number (30303052857).

Almost surely, 2^121211223313 is an apocalyptic number.

It is an amenable number.

121211223313 is a deficient number, since it is larger than the sum of its proper divisors (988115).

121211223313 is an equidigital number, since it uses as much as digits as its factorization.

121211223313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988114.

The product of its digits is 432, while the sum is 22.

Adding to 121211223313 its reverse (313322112121), we get a palindrome (434533335434).

The spelling of 121211223313 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty-three thousand, three hundred thirteen".