3129990221 has 2 divisors, whose sum is σ = 3129990222. Its totient is φ = 3129990220.

The previous prime is 3129990211. The next prime is 3129990229. The reversal of 3129990221 is 1220999213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3040309321 + 89680900 = 55139^2 + 9470^2 .

It is a cyclic number.

It is not a de Polignac number, because 3129990221 - 2²² = 3125795917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3129990229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564995110 + 1564995111.

It is an arithmetic number, because the mean of its divisors is an integer number (1564995111).

Almost surely, 2^3129990221 is an apocalyptic number.

It is an amenable number.

3129990221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3129990221 is an equidigital number, since it uses as much as digits as its factorization.

3129990221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3129990221 is about 55946.3155265832. The cubic root of 3129990221 is about 1462.7866682901.

The spelling of 3129990221 in words is "three billion, one hundred twenty-nine million, nine hundred ninety thousand, two hundred twenty-one".