11230231021 has 4 divisors (see below), whose sum is σ = 11230454844. Its totient is φ = 11230007200.

The previous prime is 11230230997. The next prime is 11230231043. The reversal of 11230231021 is 12013203211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12013203211 = 787 ⋅15264553.

It can be written as a sum of positive squares in 2 ways, for example, as 10006000900 + 1224230121 = 100030^2 + 34989^2 .

It is a cyclic number.

It is not a de Polignac number, because 11230231021 - 2⁹ = 11230230509 is a prime.

It is a super-2 number, since 2×11230231021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11230230986 and 11230231004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11230231421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2001 + ... + 149881.

It is an arithmetic number, because the mean of its divisors is an integer number (2807613711).

Almost surely, 2^11230231021 is an apocalyptic number.

It is an amenable number.

11230231021 is a deficient number, since it is larger than the sum of its proper divisors (223823).

11230231021 is an equidigital number, since it uses as much as digits as its factorization.

11230231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223822.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 11230231021 its reverse (12013203211), we get a palindrome (23243434232).

The spelling of 11230231021 in words is "eleven billion, two hundred thirty million, two hundred thirty-one thousand, twenty-one".