2721149209 has 2 divisors, whose sum is σ = 2721149210. Its totient is φ = 2721149208.

The previous prime is 2721149173. The next prime is 2721149219. The reversal of 2721149209 is 9029411272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2718579600 + 2569609 = 52140^2 + 1603^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721149209 - 2⁹ = 2721148697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2721149219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1360574604 + 1360574605.

It is an arithmetic number, because the mean of its divisors is an integer number (1360574605).

Almost surely, 2^2721149209 is an apocalyptic number.

It is an amenable number.

2721149209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2721149209 is an equidigital number, since it uses as much as digits as its factorization.

2721149209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 2721149209 is about 52164.6356164787. The cubic root of 2721149209 is about 1396.1029733937.

The spelling of 2721149209 in words is "two billion, seven hundred twenty-one million, one hundred forty-nine thousand, two hundred nine".