3221020199981 has 2 divisors, whose sum is σ = 3221020199982. Its totient is φ = 3221020199980.

The previous prime is 3221020199941. The next prime is 3221020200071. The reversal of 3221020199981 is 1899910201223.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3206785562500 + 14234637481 = 1790750^2 + 119309^2 .

It is an emirp because it is prime and its reverse (1899910201223) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3221020199981 - 2¹⁴ = 3221020183597 is a prime.

It is a super-2 number, since 2×3221020199981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221020199941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610510099990 + 1610510099991.

It is an arithmetic number, because the mean of its divisors is an integer number (1610510099991).

Almost surely, 2^{3221020199981} is an apocalyptic number.

It is an amenable number.

3221020199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221020199981 is an equidigital number, since it uses as much as digits as its factorization.

3221020199981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 3221020199981 in words is "three trillion, two hundred twenty-one billion, twenty million, one hundred ninety-nine thousand, nine hundred eighty-one".