1213321100213 has 4 divisors (see below), whose sum is σ = 1217608454208. Its totient is φ = 1209033746220.

The previous prime is 1213321100207. The next prime is 1213321100219. The reversal of 1213321100213 is 3120011233121.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (1213321100207) and next prime (1213321100219).

It is a cyclic number.

It is not a de Polignac number, because 1213321100213 - 2²⁶ = 1213253991349 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 (1213321100219) 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, 2143676573 + ... + 2143677138.

It is an arithmetic number, because the mean of its divisors is an integer number (304402113552).

Almost surely, 2^{1213321100213} is an apocalyptic number.

It is an amenable number.

1213321100213 is a deficient number, since it is larger than the sum of its proper divisors (4287353995).

1213321100213 is an equidigital number, since it uses as much as digits as its factorization.

1213321100213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287353994.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1213321100213 its reverse (3120011233121), we get a palindrome (4333332333334).

The spelling of 1213321100213 in words is "one trillion, two hundred thirteen billion, three hundred twenty-one million, one hundred thousand, two hundred thirteen".