11011021021 has 32 divisors (see below), whose sum is σ = 15098646528. Its totient is φ = 7751471040.

The previous prime is 11011021009. The next prime is 11011021039. The reversal of 11011021021 is 12012011011.

11011021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11011021021 - 2⁹ = 11011020509 is a prime.

11011021021 is a modest number, since divided by 21021 gives 11011 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 11011020989 and 11011021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011021121) 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 31 ways as a sum of consecutive naturals, for example, 69975 + ... + 164068.

It is an arithmetic number, because the mean of its divisors is an integer number (471832704).

Almost surely, 2^11011021021 is an apocalyptic number.

11011021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011021021 is a deficient number, since it is larger than the sum of its proper divisors (4087625507).

11011021021 is a wasteful number, since it uses less digits than its factorization.

11011021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234121.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11011021021 its reverse (12012011011), we get a palindrome (23023032032).

It can be divided in two parts, 110110 and 21021, that added together give a palindrome (131131).

The spelling of 11011021021 in words is "eleven billion, eleven million, twenty-one thousand, twenty-one".