2721981723 has 16 divisors (see below), whose sum is σ = 3647193600. Its totient is φ = 1805729760.

The previous prime is 2721981653. The next prime is 2721981727. The reversal of 2721981723 is 3271891272.

It is a de Polignac number, because none of the positive numbers 2^k-2721981723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2721981727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900108 + ... + 903126.

It is an arithmetic number, because the mean of its divisors is an integer number (227949600).

Almost surely, 2^2721981723 is an apocalyptic number.

2721981723 is a deficient number, since it is larger than the sum of its proper divisors (925211877).

2721981723 is a wasteful number, since it uses less digits than its factorization.

2721981723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402.

The product of its digits is 84672, while the sum is 42.

The square root of 2721981723 is about 52172.6146843342. The cubic root of 2721981723 is about 1396.2453344174.

The spelling of 2721981723 in words is "two billion, seven hundred twenty-one million, nine hundred eighty-one thousand, seven hundred twenty-three".