3220420261 has 2 divisors, whose sum is σ = 3220420262. Its totient is φ = 3220420260.

The previous prime is 3220420243. The next prime is 3220420271. The reversal of 3220420261 is 1620240223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2914380225 + 306040036 = 53985^2 + 17494^2 .

It is a cyclic number.

It is not a de Polignac number, because 3220420261 - 2⁹ = 3220419749 is a prime.

It is a super-2 number, since 2×3220420261² = 20742213314918616242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3220420271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610210130 + 1610210131.

It is an arithmetic number, because the mean of its divisors is an integer number (1610210131).

Almost surely, 2^3220420261 is an apocalyptic number.

It is an amenable number.

3220420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

3220420261 is an equidigital number, since it uses as much as digits as its factorization.

3220420261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 3220420261 is about 56748.7467791140. The cubic root of 3220420261 is about 1476.7404923512.

Adding to 3220420261 its reverse (1620240223), we get a palindrome (4840660484).

The spelling of 3220420261 in words is "three billion, two hundred twenty million, four hundred twenty thousand, two hundred sixty-one".