3521905221 has 8 divisors (see below), whose sum is σ = 4760200960. Its totient is φ = 2315773152.

The previous prime is 3521905201. The next prime is 3521905237. The reversal of 3521905221 is 1225091253.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3521905221 - 2⁹ = 3521904709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521905201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8040661 + ... + 8041098.

It is an arithmetic number, because the mean of its divisors is an integer number (595025120).

Almost surely, 2^3521905221 is an apocalyptic number.

It is an amenable number.

3521905221 is a deficient number, since it is larger than the sum of its proper divisors (1238295739).

3521905221 is a wasteful number, since it uses less digits than its factorization.

3521905221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16081835.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 3521905221 is about 59345.6419714203. The cubic root of 3521905221 is about 1521.4553842313.

Adding to 3521905221 its reverse (1225091253), we get a palindrome (4746996474).

The spelling of 3521905221 in words is "three billion, five hundred twenty-one million, nine hundred five thousand, two hundred twenty-one".