3321121021 has 2 divisors, whose sum is σ = 3321121022. Its totient is φ = 3321121020.

The previous prime is 3321121019. The next prime is 3321121043. The reversal of 3321121021 is 1201211233.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2681789796 + 639331225 = 51786^2 + 25285^2 .

It is a cyclic number.

It is not a de Polignac number, because 3321121021 - 2¹ = 3321121019 is a prime.

It is a super-2 number, since 2×3321121021² = 22059689672256164882, which contains 22 as substring.

Together with 3321121019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3321120986 and 3321121004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3321121051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660560510 + 1660560511.

It is an arithmetic number, because the mean of its divisors is an integer number (1660560511).

Almost surely, 2^3321121021 is an apocalyptic number.

It is an amenable number.

3321121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3321121021 is an equidigital number, since it uses as much as digits as its factorization.

3321121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3321121021 is about 57629.1681442653. The cubic root of 3321121021 is about 1491.9750726273.

Adding to 3321121021 its reverse (1201211233), we get a palindrome (4522332254).

The spelling of 3321121021 in words is "three billion, three hundred twenty-one million, one hundred twenty-one thousand, twenty-one".