11221217280 has 832 divisors, whose sum is σ = 49318993920. Its totient is φ = 2356936704.

The previous prime is 11221217279. The next prime is 11221217297. The reversal of 11221217280 is 8271212211.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (832).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50319249 + ... + 50319471.

Almost surely, 2^11221217280 is an apocalyptic number.

11221217280 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 11221217280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24659496960).

11221217280 is an abundant number, since it is smaller than the sum of its proper divisors (38097776640).

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

11221217280 is a wasteful number, since it uses less digits than its factorization.

11221217280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

Adding to 11221217280 its reverse (8271212211), we get a palindrome (19492429491).

The spelling of 11221217280 in words is "eleven billion, two hundred twenty-one million, two hundred seventeen thousand, two hundred eighty".