5623451721 has 12 divisors (see below), whose sum is σ = 8311665648. Its totient is φ = 3661782264.

The previous prime is 5623451711. The next prime is 5623451753. The reversal of 5623451721 is 1271543265.

5623451721 is a `hidden beast` number, since 5 + 623 + 4 + 5 + 1 + 7 + 21 = 666.

It is not a de Polignac number, because 5623451721 - 2⁶ = 5623451657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5623451711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7265055 + ... + 7265828.

It is an arithmetic number, because the mean of its divisors is an integer number (692638804).

Almost surely, 2^5623451721 is an apocalyptic number.

It is an amenable number.

5623451721 is a deficient number, since it is larger than the sum of its proper divisors (2688213927).

5623451721 is a wasteful number, since it uses less digits than its factorization.

5623451721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14530932 (or 14530929 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 5623451721 is about 74989.6774296303. The cubic root of 5623451721 is about 1778.2834650285.

Adding to 5623451721 its reverse (1271543265), we get a palindrome (6894994986).

The spelling of 5623451721 in words is "five billion, six hundred twenty-three million, four hundred fifty-one thousand, seven hundred twenty-one".