1213223212213 has 4 divisors (see below), whose sum is σ = 1213267580908. Its totient is φ = 1213178843520.

The previous prime is 1213223212207. The next prime is 1213223212241. The reversal of 1213223212213 is 3122123223121.

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 518870986929 + 694352225284 = 720327^2 + 833278^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213223212213 - 2⁹ = 1213223211701 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 (1213223212283) 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, 22143306 + ... + 22198027.

It is an arithmetic number, because the mean of its divisors is an integer number (303316895227).

Almost surely, 2^{1213223212213} is an apocalyptic number.

It is an amenable number.

1213223212213 is a deficient number, since it is larger than the sum of its proper divisors (44368695).

1213223212213 is an equidigital number, since it uses as much as digits as its factorization.

1213223212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44368694.

The product of its digits is 1728, while the sum is 25.

Adding to 1213223212213 its reverse (3122123223121), we get a palindrome (4335346435334).

The spelling of 1213223212213 in words is "one trillion, two hundred thirteen billion, two hundred twenty-three million, two hundred twelve thousand, two hundred thirteen".