3220610821 has 2 divisors, whose sum is σ = 3220610822. Its totient is φ = 3220610820.

The previous prime is 3220610819. The next prime is 3220610831. The reversal of 3220610821 is 1280160223.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3117993921 + 102616900 = 55839^2 + 10130^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220610821 - 2¹ = 3220610819 is a prime.

Together with 3220610819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220610831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610305410 + 1610305411.

It is an arithmetic number, because the mean of its divisors is an integer number (1610305411).

Almost surely, 2^3220610821 is an apocalyptic number.

It is an amenable number.

3220610821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220610821 is an equidigital number, since it uses as much as digits as its factorization.

3220610821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 3220610821 is about 56750.4257340859. The cubic root of 3220610821 is about 1476.7696192037.

The spelling of 3220610821 in words is "three billion, two hundred twenty million, six hundred ten thousand, eight hundred twenty-one".