11216221265 has 24 divisors (see below), whose sum is σ = 14535595008. Its totient is φ = 8302966560.

The previous prime is 11216221253. The next prime is 11216221271. The reversal of 11216221265 is 56212261211.

It is not a de Polignac number, because 11216221265 - 2¹² = 11216217169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5360 + ... + 149870.

It is an arithmetic number, because the mean of its divisors is an integer number (605649792).

Almost surely, 2^11216221265 is an apocalyptic number.

It is an amenable number.

11216221265 is a deficient number, since it is larger than the sum of its proper divisors (3319373743).

11216221265 is a wasteful number, since it uses less digits than its factorization.

11216221265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144597 (or 144578 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

Adding to 11216221265 its reverse (56212261211), we get a palindrome (67428482476).

The spelling of 11216221265 in words is "eleven billion, two hundred sixteen million, two hundred twenty-one thousand, two hundred sixty-five".