11011021020 has 72 divisors (see below), whose sum is σ = 34551840960. Its totient is φ = 2835020160.

The previous prime is 11011021009. The next prime is 11011021039. The reversal of 11011021020 is 2012011011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 11011020993 and 11011021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1049476 + ... + 1059915.

It is an arithmetic number, because the mean of its divisors is an integer number (479886680).

Almost surely, 2^11011021020 is an apocalyptic number.

11011021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11011021020 is an abundant number, since it is smaller than the sum of its proper divisors (23540819940).

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

11011021020 is a wasteful number, since it uses less digits than its factorization.

11011021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109435 (or 2109430 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11011021020 its reverse (2012011011), we get a palindrome (13023032031).

It can be divided in two parts, 1101 and 1021020, that added together give a square (1022121 = 1011²).

The spelling of 11011021020 in words is "eleven billion, eleven million, twenty-one thousand, twenty".