3321200021 has 2 divisors, whose sum is σ = 3321200022. Its totient is φ = 3321200020.

The previous prime is 3321199997. The next prime is 3321200027. The reversal of 3321200021 is 1200021233.

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., 3216137521 + 105062500 = 56711^2 + 10250^2 .

It is an emirp because it is prime and its reverse (1200021233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3321200021 - 2¹⁰ = 3321198997 is a prime.

It is a super-2 number, since 2×3321200021² = 22060739158980800882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3321199969 and 3321200005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3321200027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660600010 + 1660600011.

It is an arithmetic number, because the mean of its divisors is an integer number (1660600011).

Almost surely, 2^3321200021 is an apocalyptic number.

It is an amenable number.

3321200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3321200021 is an equidigital number, since it uses as much as digits as its factorization.

3321200021 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 14.

The square root of 3321200021 is about 57629.8535569890. The cubic root of 3321200021 is about 1491.9869024778.

Adding to 3321200021 its reverse (1200021233), we get a palindrome (4521221254).

The spelling of 3321200021 in words is "three billion, three hundred twenty-one million, two hundred thousand, twenty-one".