11011231021 has 8 divisors (see below), whose sum is σ = 12585643904. Its totient is φ = 9437163120.

The previous prime is 11011230991. The next prime is 11011231037. The reversal of 11011231021 is 12013211011.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11011231021 - 2²³ = 11002842413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011230992 and 11011231010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011231061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13785 + ... + 149038.

It is an arithmetic number, because the mean of its divisors is an integer number (1573205488).

Almost surely, 2^11011231021 is an apocalyptic number.

It is an amenable number.

11011231021 is a deficient number, since it is larger than the sum of its proper divisors (1574412883).

11011231021 is an equidigital number, since it uses as much as digits as its factorization.

11011231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172491.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11011231021 its reverse (12013211011), we get a palindrome (23024442032).

The spelling of 11011231021 in words is "eleven billion, eleven million, two hundred thirty-one thousand, twenty-one".