11111001021020 has 24 divisors (see below), whose sum is σ = 23334605540064. Its totient is φ = 4444114047296.

The previous prime is 11111001021011. The next prime is 11111001021049. The reversal of 11111001021020 is 2012010011111.

It is a junction number, because it is equal to n+sod(n) for n = 11111001020992 and 11111001021010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17579267 + ... + 18200346.

It is an arithmetic number, because the mean of its divisors is an integer number (972275230836).

Almost surely, 2^{11111001021020} is an apocalyptic number.

11111001021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111001021020 is an abundant number, since it is smaller than the sum of its proper divisors (12223604519044).

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

11111001021020 is a wasteful number, since it uses less digits than its factorization.

11111001021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35795149 (or 35795147 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111001021020 its reverse (2012010011111), we get a palindrome (13123011032131).

The spelling of 11111001021020 in words is "eleven trillion, one hundred eleven billion, one million, twenty-one thousand, twenty".