12231021511 has 4 divisors (see below), whose sum is σ = 12625570624. Its totient is φ = 11836472400.

The previous prime is 12231021499. The next prime is 12231021533. The reversal of 12231021511 is 11512013221.

12231021511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11512013221 = 139 ⋅82820239.

It is a cyclic number.

It is not a de Polignac number, because 12231021511 - 2⁵ = 12231021479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231021541) 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 3 ways as a sum of consecutive naturals, for example, 197274510 + ... + 197274571.

It is an arithmetic number, because the mean of its divisors is an integer number (3156392656).

Almost surely, 2^12231021511 is an apocalyptic number.

12231021511 is a deficient number, since it is larger than the sum of its proper divisors (394549113).

12231021511 is an equidigital number, since it uses as much as digits as its factorization.

12231021511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394549112.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 12231021511 its reverse (11512013221), we get a palindrome (23743034732).

The spelling of 12231021511 in words is "twelve billion, two hundred thirty-one million, twenty-one thousand, five hundred eleven".