2721918673 has 4 divisors (see below), whose sum is σ = 2724649780. Its totient is φ = 2719187568.

The previous prime is 2721918643. The next prime is 2721918707. The reversal of 2721918673 is 3768191272.

2721918673 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 2341785664 + 380133009 = 48392^2 + 19497^2 .

It is a cyclic number.

It is not a de Polignac number, because 2721918673 - 2¹³ = 2721910481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2721918643) 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, 1364058 + ... + 1366051.

It is an arithmetic number, because the mean of its divisors is an integer number (681162445).

Almost surely, 2^2721918673 is an apocalyptic number.

It is an amenable number.

2721918673 is a deficient number, since it is larger than the sum of its proper divisors (2731107).

2721918673 is an equidigital number, since it uses as much as digits as its factorization.

2721918673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731106.

The product of its digits is 254016, while the sum is 46.

The square root of 2721918673 is about 52172.0104366316. The cubic root of 2721918673 is about 1396.2345537978.

The spelling of 2721918673 in words is "two billion, seven hundred twenty-one million, nine hundred eighteen thousand, six hundred seventy-three".