11221001020 has 24 divisors (see below), whose sum is σ = 23797414368. Its totient is φ = 4443960000.

The previous prime is 11221001017. The next prime is 11221001021. The reversal of 11221001020 is 2010012211.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 11221000988 and 11221001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221001021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775456 + ... + 2779495.

It is an arithmetic number, because the mean of its divisors is an integer number (991558932).

Almost surely, 2^11221001020 is an apocalyptic number.

11221001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221001020 is an abundant number, since it is smaller than the sum of its proper divisors (12576413348).

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

11221001020 is a wasteful number, since it uses less digits than its factorization.

11221001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555061 (or 5555059 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11221001020 its reverse (2010012211), we get a palindrome (13231013231).

The spelling of 11221001020 in words is "eleven billion, two hundred twenty-one million, one thousand, twenty".