3221131436561 has 8 divisors (see below), whose sum is σ = 3274856217000. Its totient is φ = 3167834742400.

The previous prime is 3221131436531. The next prime is 3221131436591. The reversal of 3221131436561 is 1656341311223.

3221131436561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3221131436531) and next prime (3221131436591).

It can be written as a sum of positive squares in 4 ways, for example, as 474488146561 + 2746643290000 = 688831^2 + 1657300^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3221131436561 - 2¹⁰ = 3221131435537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3221131436531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107006396 + ... + 107036493.

It is an arithmetic number, because the mean of its divisors is an integer number (409357027125).

Almost surely, 2^{3221131436561} is an apocalyptic number.

It is an amenable number.

3221131436561 is a deficient number, since it is larger than the sum of its proper divisors (53724780439).

3221131436561 is a wasteful number, since it uses less digits than its factorization.

3221131436561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214043139.

The product of its digits is 77760, while the sum is 38.

Adding to 3221131436561 its reverse (1656341311223), we get a palindrome (4877472747784).

The spelling of 3221131436561 in words is "three trillion, two hundred twenty-one billion, one hundred thirty-one million, four hundred thirty-six thousand, five hundred sixty-one".