3225121721 has 2 divisors, whose sum is σ = 3225121722. Its totient is φ = 3225121720.

The previous prime is 3225121681. The next prime is 3225121723. The reversal of 3225121721 is 1271215223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2145079225 + 1080042496 = 46315^2 + 32864^2 .

It is a cyclic number.

It is not a de Polignac number, because 3225121721 - 2¹⁴ = 3225105337 is a prime.

Together with 3225121723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3225121723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1612560860 + 1612560861.

It is an arithmetic number, because the mean of its divisors is an integer number (1612560861).

Almost surely, 2^3225121721 is an apocalyptic number.

It is an amenable number.

3225121721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3225121721 is an equidigital number, since it uses as much as digits as its factorization.

3225121721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 3225121721 is about 56790.1551415384. The cubic root of 3225121721 is about 1477.4587692568.

Adding to 3225121721 its reverse (1271215223), we get a palindrome (4496336944).

The spelling of 3225121721 in words is "three billion, two hundred twenty-five million, one hundred twenty-one thousand, seven hundred twenty-one".