4404206521 has 24 divisors (see below), whose sum is σ = 5251137920. Its totient is φ = 3669066720.

The previous prime is 4404206489. The next prime is 4404206537. The reversal of 4404206521 is 1256024044.

4404206521 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 4404206521 - 2⁵ = 4404206489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4404206521.

It is not an unprimeable number, because it can be changed into a prime (4404206551) 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, 208576 + ... + 228718.

Almost surely, 2^4404206521 is an apocalyptic number.

It is an amenable number.

4404206521 is a deficient number, since it is larger than the sum of its proper divisors (846931399).

4404206521 is a wasteful number, since it uses less digits than its factorization.

4404206521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20317 (or 20306 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 4404206521 is about 66364.1960774031. The cubic root of 4404206521 is about 1639.1645706558.

It can be divided in two parts, 4404 and 206521, that added together give a triangular number (210925 = T₆₄₉).

The spelling of 4404206521 in words is "four billion, four hundred four million, two hundred six thousand, five hundred twenty-one".