11001331220 has 48 divisors (see below), whose sum is σ = 25260681600. Its totient is φ = 3991336320.

The previous prime is 11001331177. The next prime is 11001331267. The reversal of 11001331220 is 2213310011.

It is a super-2 number, since 2×11001331220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11001331195 and 11001331204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39626 + ... + 153534.

It is an arithmetic number, because the mean of its divisors is an integer number (526264200).

Almost surely, 2^11001331220 is an apocalyptic number.

11001331220 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 11001331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12630340800).

11001331220 is an abundant number, since it is smaller than the sum of its proper divisors (14259350380).

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

11001331220 is a wasteful number, since it uses less digits than its factorization.

11001331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114368 (or 114366 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 11001331220 its reverse (2213310011), we get a palindrome (13214641231).

The spelling of 11001331220 in words is "eleven billion, one million, three hundred thirty-one thousand, two hundred twenty".