12231551140021 has 2 divisors, whose sum is σ = 12231551140022. Its totient is φ = 12231551140020.

The previous prime is 12231551140019. The next prime is 12231551140049. The reversal of 12231551140021 is 12004115513221.

It is an a-pointer prime, because the next prime (12231551140049) can be obtained adding 12231551140021 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7512724674225 + 4718826465796 = 2740935^2 + 2172286^2 .

It is a cyclic number.

It is not a de Polignac number, because 12231551140021 - 2¹ = 12231551140019 is a prime.

It is a super-2 number, since 2×12231551140021² (a number of 27 digits) contains 22 as substring.

Together with 12231551140019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12231551140001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6115775570010 + 6115775570011.

It is an arithmetic number, because the mean of its divisors is an integer number (6115775570011).

Almost surely, 2^{12231551140021} is an apocalyptic number.

It is an amenable number.

12231551140021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12231551140021 is an equidigital number, since it uses as much as digits as its factorization.

12231551140021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 12231551140021 its reverse (12004115513221), we get a palindrome (24235666653242).

The spelling of 12231551140021 in words is "twelve trillion, two hundred thirty-one billion, five hundred fifty-one million, one hundred forty thousand, twenty-one".