11312312121221 has 4 divisors (see below), whose sum is σ = 11312496479244. Its totient is φ = 11312127763200.

The previous prime is 11312312121157. The next prime is 11312312121241. The reversal of 11312312121221 is 12212121321311.

11312312121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 927734976100 + 10384577145121 = 963190^2 + 3222511^2 .

It is a cyclic number.

It is not a de Polignac number, because 11312312121221 - 2⁶ = 11312312121157 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 (11312312121241) 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, 92086940 + ... + 92209701.

It is an arithmetic number, because the mean of its divisors is an integer number (2828124119811).

Almost surely, 2^{11312312121221} is an apocalyptic number.

It is an amenable number.

11312312121221 is a deficient number, since it is larger than the sum of its proper divisors (184358023).

11312312121221 is an equidigital number, since it uses as much as digits as its factorization.

11312312121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184358022.

The product of its digits is 288, while the sum is 23.

Adding to 11312312121221 its reverse (12212121321311), we get a palindrome (23524433442532).

The spelling of 11312312121221 in words is "eleven trillion, three hundred twelve billion, three hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".