3221670521 has 4 divisors (see below), whose sum is σ = 3226267044. Its totient is φ = 3217074000.

The previous prime is 3221670503. The next prime is 3221670583. The reversal of 3221670521 is 1250761223.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2564004496 + 657666025 = 50636^2 + 25645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3221670521 is a prime.

It is a super-2 number, since 2×3221670521² = 20758321891760822882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3221675521) 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 3 ways as a sum of consecutive naturals, for example, 2297210 + ... + 2298611.

It is an arithmetic number, because the mean of its divisors is an integer number (806566761).

Almost surely, 2^3221670521 is an apocalyptic number.

It is an amenable number.

3221670521 is a deficient number, since it is larger than the sum of its proper divisors (4596523).

3221670521 is an equidigital number, since it uses as much as digits as its factorization.

3221670521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4596522.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 3221670521 is about 56759.7614600343. The cubic root of 3221670521 is about 1476.9315720385.

The spelling of 3221670521 in words is "three billion, two hundred twenty-one million, six hundred seventy thousand, five hundred twenty-one".