3331021321981 has 2 divisors, whose sum is σ = 3331021321982. Its totient is φ = 3331021321980.

The previous prime is 3331021321909. The next prime is 3331021321993. The reversal of 3331021321981 is 1891231201333.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3317895037081 + 13126284900 = 1821509^2 + 114570^2 .

It is a cyclic number.

It is not a de Polignac number, because 3331021321981 - 2⁹ = 3331021321469 is a prime.

It is a super-2 number, since 2×3331021321981² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3331021321981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3331021328981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665510660990 + 1665510660991.

It is an arithmetic number, because the mean of its divisors is an integer number (1665510660991).

Almost surely, 2^{3331021321981} is an apocalyptic number.

It is an amenable number.

3331021321981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3331021321981 is an equidigital number, since it uses as much as digits as its factorization.

3331021321981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 3331021321981 in words is "three trillion, three hundred thirty-one billion, twenty-one million, three hundred twenty-one thousand, nine hundred eighty-one".