3221071021 has 4 divisors (see below), whose sum is σ = 3681224032. Its totient is φ = 2760918012.

The previous prime is 3221071019. The next prime is 3221071031. The reversal of 3221071021 is 1201701223.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201701223 = 337 ⋅3565879.

It is a cyclic number.

It is not a de Polignac number, because 3221071021 - 2¹ = 3221071019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3221071021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221071031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230076495 + ... + 230076508.

It is an arithmetic number, because the mean of its divisors is an integer number (920306008).

Almost surely, 2^3221071021 is an apocalyptic number.

It is an amenable number.

3221071021 is a deficient number, since it is larger than the sum of its proper divisors (460153011).

3221071021 is an equidigital number, since it uses as much as digits as its factorization.

3221071021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460153010.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 3221071021 is about 56754.4801843872. The cubic root of 3221071021 is about 1476.8399554483.

Adding to 3221071021 its reverse (1201701223), we get a palindrome (4422772244).

The spelling of 3221071021 in words is "three billion, two hundred twenty-one million, seventy-one thousand, twenty-one".