11221021213 has 4 divisors (see below), whose sum is σ = 11225879008. Its totient is φ = 11216163420.

The previous prime is 11221021111. The next prime is 11221021219. The reversal of 11221021213 is 31212012211.

11221021213 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31212012211 = 9181 ⋅3399631.

It is a cyclic number.

It is not a de Polignac number, because 11221021213 - 2¹⁷ = 11220890141 is a prime.

It is a super-2 number, since 2×11221021213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221021219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2425431 + ... + 2430052.

It is an arithmetic number, because the mean of its divisors is an integer number (2806469752).

Almost surely, 2^11221021213 is an apocalyptic number.

It is an amenable number.

11221021213 is a deficient number, since it is larger than the sum of its proper divisors (4857795).

11221021213 is an equidigital number, since it uses as much as digits as its factorization.

11221021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857794.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11221021213 its reverse (31212012211), we get a palindrome (42433033424).

The spelling of 11221021213 in words is "eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred thirteen".