11001220210020 has 96 divisors (see below), whose sum is σ = 31091136531840. Its totient is φ = 2906265692160.

The previous prime is 11001220209953. The next prime is 11001220210051. The reversal of 11001220210020 is 2001202210011.

It is a super-2 number, since 2×11001220210020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11001220209978 and 11001220210005.

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, 40484524 + ... + 40755356.

It is an arithmetic number, because the mean of its divisors is an integer number (323866005540).

Almost surely, 2^{11001220210020} is an apocalyptic number.

11001220210020 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 11001220210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15545568265920).

11001220210020 is an abundant number, since it is smaller than the sum of its proper divisors (20089916321820).

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

11001220210020 is a wasteful number, since it uses less digits than its factorization.

11001220210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277165 (or 277163 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11001220210020 its reverse (2001202210011), we get a palindrome (13002422420031).

Subtracting from 11001220210020 its reverse (2001202210011), we obtain a square (9000018000009 = 3000003²).

The spelling of 11001220210020 in words is "eleven trillion, one billion, two hundred twenty million, two hundred ten thousand, twenty".