2138220449 has 2 divisors, whose sum is σ = 2138220450. Its totient is φ = 2138220448.

The previous prime is 2138220437. The next prime is 2138220457. The reversal of 2138220449 is 9440228312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2125210000 + 13010449 = 46100^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138220449 - 2¹⁶ = 2138154913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2138220349) 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, 1069110224 + 1069110225.

It is an arithmetic number, because the mean of its divisors is an integer number (1069110225).

Almost surely, 2^2138220449 is an apocalyptic number.

It is an amenable number.

2138220449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138220449 is an equidigital number, since it uses as much as digits as its factorization.

2138220449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 2138220449 is about 46240.8958498860. The cubic root of 2138220449 is about 1288.3014419337.

The spelling of 2138220449 in words is "two billion, one hundred thirty-eight million, two hundred twenty thousand, four hundred forty-nine".