2751072721 has 4 divisors (see below), whose sum is σ = 2752845732. Its totient is φ = 2749299712.

The previous prime is 2751072697. The next prime is 2751072767. The reversal of 2751072721 is 1272701572.

2751072721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1408876225 + 1342196496 = 37535^2 + 36636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2751072721 - 2⁵ = 2751072689 is a prime.

It is a super-2 number, since 2×2751072721² = 15136802232460687682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2751072521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884176 + ... + 887281.

It is an arithmetic number, because the mean of its divisors is an integer number (688211433).

Almost surely, 2^2751072721 is an apocalyptic number.

It is an amenable number.

2751072721 is a deficient number, since it is larger than the sum of its proper divisors (1773011).

2751072721 is a wasteful number, since it uses less digits than its factorization.

2751072721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773010.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 2751072721 is about 52450.6694046892. The cubic root of 2751072721 is about 1401.2018117327.

The spelling of 2751072721 in words is "two billion, seven hundred fifty-one million, seventy-two thousand, seven hundred twenty-one".