2721320623 has 6 divisors (see below), whose sum is σ = 3110238456. Its totient is φ = 2332442232.

The previous prime is 2721320617. The next prime is 2721320717. The reversal of 2721320623 is 3260231272.

It is not a de Polignac number, because 2721320623 - 2⁹ = 2721320111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2721320591 and 2721320600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721320603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128161 + ... + 147877.

It is an arithmetic number, because the mean of its divisors is an integer number (518373076).

Almost surely, 2^2721320623 is an apocalyptic number.

2721320623 is a deficient number, since it is larger than the sum of its proper divisors (388917833).

2721320623 is an frugal number, since it uses more digits than its factorization.

2721320623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39441 (or 19724 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 2721320623 is about 52166.2786002605. The cubic root of 2721320623 is about 1396.1322877938.

Multiplying 2721320623 by its sum of digits (28), we get a square (76196977444 = 276038²).

Adding to 2721320623 its reverse (3260231272), we get a palindrome (5981551895).

The spelling of 2721320623 in words is "two billion, seven hundred twenty-one million, three hundred twenty thousand, six hundred twenty-three".