11221211513 has 4 divisors (see below), whose sum is σ = 11221675620. Its totient is φ = 11220747408.

The previous prime is 11221211473. The next prime is 11221211527. The reversal of 11221211513 is 31511212211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31511212211 = 509 ⋅61908079.

It can be written as a sum of positive squares in 2 ways, for example, as 4492618729 + 6728592784 = 67027^2 + 82028^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221211513 - 2¹⁰ = 11221210489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221211713) 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, 193670 + ... + 244847.

It is an arithmetic number, because the mean of its divisors is an integer number (2805418905).

Almost surely, 2^11221211513 is an apocalyptic number.

It is an amenable number.

11221211513 is a deficient number, since it is larger than the sum of its proper divisors (464107).

11221211513 is an equidigital number, since it uses as much as digits as its factorization.

11221211513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464106.

The product of its digits is 120, while the sum is 20.

Adding to 11221211513 its reverse (31511212211), we get a palindrome (42732423724).

The spelling of 11221211513 in words is "eleven billion, two hundred twenty-one million, two hundred eleven thousand, five hundred thirteen".