3216044420621 has 4 divisors (see below), whose sum is σ = 3216080984700. Its totient is φ = 3216007856544.

The previous prime is 3216044420609. The next prime is 3216044420627. The reversal of 3216044420621 is 1260244406123.

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 1132681275625 + 2083363144996 = 1064275^2 + 1443386^2 .

It is a cyclic number.

It is not a de Polignac number, because 3216044420621 - 2¹⁸ = 3216044158477 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 (3216044420627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18149786 + ... + 18326123.

It is an arithmetic number, because the mean of its divisors is an integer number (804020246175).

Almost surely, 2^{3216044420621} is an apocalyptic number.

It is an amenable number.

3216044420621 is a deficient number, since it is larger than the sum of its proper divisors (36564079).

3216044420621 is an equidigital number, since it uses as much as digits as its factorization.

3216044420621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36564078.

The product of its (nonzero) digits is 55296, while the sum is 35.

Adding to 3216044420621 its reverse (1260244406123), we get a palindrome (4476288826744).

The spelling of 3216044420621 in words is "three trillion, two hundred sixteen billion, forty-four million, four hundred twenty thousand, six hundred twenty-one".