12021043231 has 2 divisors, whose sum is σ = 12021043232. Its totient is φ = 12021043230.

The previous prime is 12021043207. The next prime is 12021043249. The reversal of 12021043231 is 13234012021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12021043231 - 2⁷ = 12021043103 is a prime.

It is a super-2 number, since 2×12021043231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12021043199 and 12021043208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021043201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010521615 + 6010521616.

It is an arithmetic number, because the mean of its divisors is an integer number (6010521616).

Almost surely, 2^12021043231 is an apocalyptic number.

12021043231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021043231 is an equidigital number, since it uses as much as digits as its factorization.

12021043231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12021043231 its reverse (13234012021), we get a palindrome (25255055252).

The spelling of 12021043231 in words is "twelve billion, twenty-one million, forty-three thousand, two hundred thirty-one".