3213020021 has 4 divisors (see below), whose sum is σ = 3213920844. Its totient is φ = 3212119200.

The previous prime is 3213020003. The next prime is 3213020033. The reversal of 3213020021 is 1200203123.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1200203123 = 7 ⋅171457589.

It can be written as a sum of positive squares in 2 ways, for example, as 2759926225 + 453093796 = 52535^2 + 21286^2 .

It is a cyclic number.

It is not a de Polignac number, because 3213020021 - 2¹⁴ = 3213003637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3213019978 and 3213020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3213020051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445040 + ... + 452201.

It is an arithmetic number, because the mean of its divisors is an integer number (803480211).

Almost surely, 2^3213020021 is an apocalyptic number.

It is an amenable number.

3213020021 is a deficient number, since it is larger than the sum of its proper divisors (900823).

3213020021 is an equidigital number, since it uses as much as digits as its factorization.

3213020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900822.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 3213020021 is about 56683.5074867461. The cubic root of 3213020021 is about 1475.6084852857.

Adding to 3213020021 its reverse (1200203123), we get a palindrome (4413223144).

The spelling of 3213020021 in words is "three billion, two hundred thirteen million, twenty thousand, twenty-one".