3221721039893 has 2 divisors, whose sum is σ = 3221721039894. Its totient is φ = 3221721039892.

The previous prime is 3221721039881. The next prime is 3221721039907. The reversal of 3221721039893 is 3989301271223.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2278961602129 + 942759437764 = 1509623^2 + 970958^2 .

It is a cyclic number.

It is not a de Polignac number, because 3221721039893 - 2²⁶ = 3221653931029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221721039863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610860519946 + 1610860519947.

It is an arithmetic number, because the mean of its divisors is an integer number (1610860519947).

Almost surely, 2^{3221721039893} is an apocalyptic number.

It is an amenable number.

3221721039893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221721039893 is an equidigital number, since it uses as much as digits as its factorization.

3221721039893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 3221721039893 in words is "three trillion, two hundred twenty-one billion, seven hundred twenty-one million, thirty-nine thousand, eight hundred ninety-three".