3221621165 has 32 divisors (see below), whose sum is σ = 4656890880. Its totient is φ = 2092656384.

The previous prime is 3221621147. The next prime is 3221621167. The reversal of 3221621165 is 5611261223.

It is not a de Polignac number, because 3221621165 - 2¹⁶ = 3221555629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221621167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23852 + ... + 83738.

It is an arithmetic number, because the mean of its divisors is an integer number (145527840).

Almost surely, 2^3221621165 is an apocalyptic number.

3221621165 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3221621165 is a deficient number, since it is larger than the sum of its proper divisors (1435269715).

3221621165 is a wasteful number, since it uses less digits than its factorization.

3221621165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59981.

The product of its digits is 4320, while the sum is 29.

The square root of 3221621165 is about 56759.3266785292. The cubic root of 3221621165 is about 1476.9240298016.

Adding to 3221621165 its reverse (5611261223), we get a palindrome (8832882388).

The spelling of 3221621165 in words is "three billion, two hundred twenty-one million, six hundred twenty-one thousand, one hundred sixty-five".