3126125221 has 2 divisors, whose sum is σ = 3126125222. Its totient is φ = 3126125220.

The previous prime is 3126125213. The next prime is 3126125231. The reversal of 3126125221 is 1225216213.

3126125221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3004574596 + 121550625 = 54814^2 + 11025^2 .

It is a cyclic number.

It is not a de Polignac number, because 3126125221 - 2³ = 3126125213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3126125231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1563062610 + 1563062611.

It is an arithmetic number, because the mean of its divisors is an integer number (1563062611).

Almost surely, 2^3126125221 is an apocalyptic number.

It is an amenable number.

3126125221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3126125221 is an equidigital number, since it uses as much as digits as its factorization.

3126125221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 3126125221 is about 55911.7628142773. The cubic root of 3126125221 is about 1462.1843235782.

The spelling of 3126125221 in words is "three billion, one hundred twenty-six million, one hundred twenty-five thousand, two hundred twenty-one".