2721511905 has 32 divisors (see below), whose sum is σ = 5044664064. Its totient is φ = 1227073536.

The previous prime is 2721511901. The next prime is 2721511907. The reversal of 2721511905 is 5091151272.

It is not a de Polignac number, because 2721511905 - 2² = 2721511901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2721511901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169864 + ... + 185193.

It is an arithmetic number, because the mean of its divisors is an integer number (157645752).

Almost surely, 2^2721511905 is an apocalyptic number.

It is an amenable number.

2721511905 is a deficient number, since it is larger than the sum of its proper divisors (2323152159).

2721511905 is a wasteful number, since it uses less digits than its factorization.

2721511905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355145.

The product of its (nonzero) digits is 6300, while the sum is 33.

The square root of 2721511905 is about 52168.1119554848. Note that the first 3 decimals coincide. The cubic root of 2721511905 is about 1396.1649984708.

The spelling of 2721511905 in words is "two billion, seven hundred twenty-one million, five hundred eleven thousand, nine hundred five".