11012221020 has 96 divisors (see below), whose sum is σ = 32625895680. Its totient is φ = 2767564800.

The previous prime is 11012220959. The next prime is 11012221027. The reversal of 11012221020 is 2012221011.

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 = 11012220987 and 11012221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012221027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194995 + ... + 245045.

It is an arithmetic number, because the mean of its divisors is an integer number (339853080).

Almost surely, 2^11012221020 is an apocalyptic number.

11012221020 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 11012221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16312947840).

11012221020 is an abundant number, since it is smaller than the sum of its proper divisors (21613674660).

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

11012221020 is a wasteful number, since it uses less digits than its factorization.

11012221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50275 (or 50273 counting only the distinct ones).

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

Adding to 11012221020 its reverse (2012221011), we get a palindrome (13024442031).

Subtracting from 11012221020 its reverse (2012221011), we obtain a palindrome (9000000009).

The spelling of 11012221020 in words is "eleven billion, twelve million, two hundred twenty-one thousand, twenty".