3217921387225 has 6 divisors (see below), whose sum is σ = 3990222520190. Its totient is φ = 2574337109760.

The previous prime is 3217921387217. The next prime is 3217921387237. The reversal of 3217921387225 is 5227831297123.

It can be written as a sum of positive squares in 3 ways, for example, as 6324066576 + 3211597320649 = 79524^2 + 1792093^2 .

It is not a de Polignac number, because 3217921387225 - 2³ = 3217921387217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64358427720 + ... + 64358427769.

Almost surely, 2^{3217921387225} is an apocalyptic number.

It is an amenable number.

3217921387225 is a deficient number, since it is larger than the sum of its proper divisors (772301132965).

3217921387225 is a wasteful number, since it uses less digits than its factorization.

3217921387225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128716855499 (or 128716855494 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 52.

The spelling of 3217921387225 in words is "three trillion, two hundred seventeen billion, nine hundred twenty-one million, three hundred eighty-seven thousand, two hundred twenty-five".