121312211213 has 4 divisors (see below), whose sum is σ = 125495390940. Its totient is φ = 117129031488.

The previous prime is 121312211173. The next prime is 121312211227. The reversal of 121312211213 is 312112213121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62281191844 + 59031019369 = 249562^2 + 242963^2 .

It is a cyclic number.

It is not a de Polignac number, because 121312211213 - 2¹⁸ = 121311949069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312211233) 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 3 ways as a sum of consecutive naturals, for example, 2091589820 + ... + 2091589877.

It is an arithmetic number, because the mean of its divisors is an integer number (31373847735).

Almost surely, 2^121312211213 is an apocalyptic number.

It is an amenable number.

121312211213 is a deficient number, since it is larger than the sum of its proper divisors (4183179727).

121312211213 is an equidigital number, since it uses as much as digits as its factorization.

121312211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4183179726.

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

Adding to 121312211213 its reverse (312112213121), we get a palindrome (433424424334).

The spelling of 121312211213 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred eleven thousand, two hundred thirteen".