2721216823 has 4 divisors (see below), whose sum is σ = 2930541208. Its totient is φ = 2511892440.

The previous prime is 2721216793. The next prime is 2721216833. The reversal of 2721216823 is 3286121272.

It is a happy number.

2721216823 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 is a cyclic number.

It is not a de Polignac number, because 2721216823 - 2²¹ = 2719119671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721216833) 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, 104662173 + ... + 104662198.

It is an arithmetic number, because the mean of its divisors is an integer number (732635302).

Almost surely, 2^2721216823 is an apocalyptic number.

2721216823 is a deficient number, since it is larger than the sum of its proper divisors (209324385).

2721216823 is a wasteful number, since it uses less digits than its factorization.

2721216823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209324384.

The product of its digits is 16128, while the sum is 34.

The square root of 2721216823 is about 52165.2836951933. The cubic root of 2721216823 is about 1396.1145365627.

The spelling of 2721216823 in words is "two billion, seven hundred twenty-one million, two hundred sixteen thousand, eight hundred twenty-three".