4467645721 has 32 divisors (see below), whose sum is σ = 5771566080. Its totient is φ = 3355732800.

The previous prime is 4467645701. The next prime is 4467645727. The reversal of 4467645721 is 1275467644.

4467645721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4467645721 - 2¹⁵ = 4467612953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4467645727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1809730 + ... + 1812196.

It is an arithmetic number, because the mean of its divisors is an integer number (180361440).

Almost surely, 2^4467645721 is an apocalyptic number.

It is an amenable number.

4467645721 is a deficient number, since it is larger than the sum of its proper divisors (1303920359).

4467645721 is a wasteful number, since it uses less digits than its factorization.

4467645721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325.

The product of its digits is 1128960, while the sum is 46.

The square root of 4467645721 is about 66840.4497366677. The cubic root of 4467645721 is about 1646.9973823437.

The spelling of 4467645721 in words is "four billion, four hundred sixty-seven million, six hundred forty-five thousand, seven hundred twenty-one".