11111001020 has 24 divisors (see below), whose sum is σ = 26666402784. Its totient is φ = 3809486016.

The previous prime is 11111000993. The next prime is 11111001029. The reversal of 11111001020 is 2010011111.

It is a happy number.

11111001020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 11111000989 and 11111001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111001029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39682007 + ... + 39682286.

It is an arithmetic number, because the mean of its divisors is an integer number (1111100116).

Almost surely, 2^11111001020 is an apocalyptic number.

11111001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111001020 is an abundant number, since it is smaller than the sum of its proper divisors (15555401764).

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

11111001020 is a wasteful number, since it uses less digits than its factorization.

11111001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79364309 (or 79364307 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 11111001020 its reverse (2010011111), we get a palindrome (13121012131).

The spelling of 11111001020 in words is "eleven billion, one hundred eleven million, one thousand, twenty".