12312066021221 has 2 divisors, whose sum is σ = 12312066021222. Its totient is φ = 12312066021220.

The previous prime is 12312066021197. The next prime is 12312066021259. The reversal of 12312066021221 is 12212066021321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12280609096900 + 31456924321 = 3504370^2 + 177361^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312066021221 - 2¹⁰ = 12312066020197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312066023221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156033010610 + 6156033010611.

It is an arithmetic number, because the mean of its divisors is an integer number (6156033010611).

Almost surely, 2^{12312066021221} is an apocalyptic number.

It is an amenable number.

12312066021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312066021221 is an equidigital number, since it uses as much as digits as its factorization.

12312066021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 12312066021221 in words is "twelve trillion, three hundred twelve billion, sixty-six million, twenty-one thousand, two hundred twenty-one".