3120531221 has 2 divisors, whose sum is σ = 3120531222. Its totient is φ = 3120531220.

The previous prime is 3120531151. The next prime is 3120531223. The reversal of 3120531221 is 1221350213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2527072900 + 593458321 = 50270^2 + 24361^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120531221 - 2¹⁸ = 3120269077 is a prime.

Together with 3120531223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3120531193 and 3120531202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3120531223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560265610 + 1560265611.

It is an arithmetic number, because the mean of its divisors is an integer number (1560265611).

Almost surely, 2^3120531221 is an apocalyptic number.

It is an amenable number.

3120531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3120531221 is an equidigital number, since it uses as much as digits as its factorization.

3120531221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 3120531221 is about 55861.7151634283. The cubic root of 3120531221 is about 1461.3116412365.

Adding to 3120531221 its reverse (1221350213), we get a palindrome (4341881434).

It can be divided in two parts, 31205 and 31221, that added together give a palindrome (62426).

The spelling of 3120531221 in words is "three billion, one hundred twenty million, five hundred thirty-one thousand, two hundred twenty-one".