15772140205321 has 2 divisors, whose sum is σ = 15772140205322. Its totient is φ = 15772140205320.

The previous prime is 15772140205189. The next prime is 15772140205351. The reversal of 15772140205321 is 12350204127751.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13535305889296 + 2236834316025 = 3679036^2 + 1495605^2 .

It is a cyclic number.

It is not a de Polignac number, because 15772140205321 - 2¹¹ = 15772140203273 is a prime.

It is not a weakly prime, because it can be changed into another prime (15772140205351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7886070102660 + 7886070102661.

It is an arithmetic number, because the mean of its divisors is an integer number (7886070102661).

Almost surely, 2^{15772140205321} is an apocalyptic number.

It is an amenable number.

15772140205321 is a deficient number, since it is larger than the sum of its proper divisors (1).

15772140205321 is an equidigital number, since it uses as much as digits as its factorization.

15772140205321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 15772140205321 in words is "fifteen trillion, seven hundred seventy-two billion, one hundred forty million, two hundred five thousand, three hundred twenty-one".