3221816854021 has 2 divisors, whose sum is σ = 3221816854022. Its totient is φ = 3221816854020.

The previous prime is 3221816853929. The next prime is 3221816854099. The reversal of 3221816854021 is 1204586181223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2483224430625 + 738592423396 = 1575825^2 + 859414^2 .

It is an emirp because it is prime and its reverse (1204586181223) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3221816854021 - 2¹¹ = 3221816851973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221816851021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610908427010 + 1610908427011.

It is an arithmetic number, because the mean of its divisors is an integer number (1610908427011).

Almost surely, 2^{3221816854021} is an apocalyptic number.

It is an amenable number.

3221816854021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221816854021 is an equidigital number, since it uses as much as digits as its factorization.

3221816854021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 3221816854021 in words is "three trillion, two hundred twenty-one billion, eight hundred sixteen million, eight hundred fifty-four thousand, twenty-one".