4405721453221 has 24 divisors (see below), whose sum is σ = 4963439436032. Its totient is φ = 3905609400000.

The previous prime is 4405721453179. The next prime is 4405721453233. The reversal of 4405721453221 is 1223541275044.

4405721453221 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 4405721453221 - 2⁹ = 4405721452709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4405721453821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2460721 + ... + 3855721.

Almost surely, 2^{4405721453221} is an apocalyptic number.

It is an amenable number.

4405721453221 is a deficient number, since it is larger than the sum of its proper divisors (557717982811).

4405721453221 is a wasteful number, since it uses less digits than its factorization.

4405721453221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395673 (or 1395662 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 4405721453221 in words is "four trillion, four hundred five billion, seven hundred twenty-one million, four hundred fifty-three thousand, two hundred twenty-one".