11211365220 has 96 divisors (see below), whose sum is σ = 34266710016. Its totient is φ = 2716233600.

The previous prime is 11211365213. The next prime is 11211365261. The reversal of 11211365220 is 2256311211.

It is a happy number.

It is a super-3 number, since 3×11211365220³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1323037 + ... + 1331483.

It is an arithmetic number, because the mean of its divisors is an integer number (356944896).

Almost surely, 2^11211365220 is an apocalyptic number.

11211365220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11211365220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17133355008).

11211365220 is an abundant number, since it is smaller than the sum of its proper divisors (23055344796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211365220 is a wasteful number, since it uses less digits than its factorization.

11211365220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481 (or 10479 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 11211365220 its reverse (2256311211), we get a palindrome (13467676431).

The spelling of 11211365220 in words is "eleven billion, two hundred eleven million, three hundred sixty-five thousand, two hundred twenty".