3299021981 has 2 divisors, whose sum is σ = 3299021982. Its totient is φ = 3299021980.

The previous prime is 3299021923. The next prime is 3299021983. The reversal of 3299021981 is 1891209923.

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., 3143396356 + 155625625 = 56066^2 + 12475^2 .

It is a cyclic number.

It is not a de Polignac number, because 3299021981 - 2¹⁰ = 3299020957 is a prime.

It is a super-2 number, since 2×3299021981² = 21767092062242328722, which contains 22 as substring.

Together with 3299021983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3299021983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1649510990 + 1649510991.

It is an arithmetic number, because the mean of its divisors is an integer number (1649510991).

Almost surely, 2^3299021981 is an apocalyptic number.

It is an amenable number.

3299021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3299021981 is an equidigital number, since it uses as much as digits as its factorization.

3299021981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 3299021981 is about 57437.1132718210. The cubic root of 3299021981 is about 1488.6584596217.

The spelling of 3299021981 in words is "three billion, two hundred ninety-nine million, twenty-one thousand, nine hundred eighty-one".