11001001020 has 48 divisors (see below), whose sum is σ = 30815654688. Its totient is φ = 2932376320.

The previous prime is 11001001003. The next prime is 11001001043. The reversal of 11001001020 is 2010010011.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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, 111610 + ... + 185630.

It is an arithmetic number, because the mean of its divisors is an integer number (641992806).

Almost surely, 2^11001001020 is an apocalyptic number.

11001001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11001001020 is an abundant number, since it is smaller than the sum of its proper divisors (19814653668).

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

11001001020 is a wasteful number, since it uses less digits than its factorization.

11001001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76510 (or 76508 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 11001001020 its reverse (2010010011), we get a palindrome (13011011031).

The spelling of 11001001020 in words is "eleven billion, one million, one thousand, twenty".