15221002112209 has 2 divisors, whose sum is σ = 15221002112210. Its totient is φ = 15221002112208.

The previous prime is 15221002112161. The next prime is 15221002112249. The reversal of 15221002112209 is 90221120012251.

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., 14280689840400 + 940312271809 = 3778980^2 + 969697^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221002112209 - 2¹³ = 15221002104017 is a prime.

It is not a weakly prime, because it can be changed into another prime (15221002112249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610501056104 + 7610501056105.

It is an arithmetic number, because the mean of its divisors is an integer number (7610501056105).

Almost surely, 2^{15221002112209} is an apocalyptic number.

It is an amenable number.

15221002112209 is a deficient number, since it is larger than the sum of its proper divisors (1).

15221002112209 is an equidigital number, since it uses as much as digits as its factorization.

15221002112209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 15221002112209 in words is "fifteen trillion, two hundred twenty-one billion, two million, one hundred twelve thousand, two hundred nine".