3220752721 has 8 divisors (see below), whose sum is σ = 3367224000. Its totient is φ = 3074818032.

The previous prime is 3220752671. The next prime is 3220752739. The reversal of 3220752721 is 1272570223.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3220752721 - 2²⁷ = 3086534993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3220752791) 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 7 ways as a sum of consecutive naturals, for example, 121846 + ... + 145903.

It is an arithmetic number, because the mean of its divisors is an integer number (420903000).

Almost surely, 2^3220752721 is an apocalyptic number.

It is an amenable number.

3220752721 is a deficient number, since it is larger than the sum of its proper divisors (146471279).

3220752721 is a wasteful number, since it uses less digits than its factorization.

3220752721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268295.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 3220752721 is about 56751.6759312005. The cubic root of 3220752721 is about 1476.7913076911.

The spelling of 3220752721 in words is "three billion, two hundred twenty million, seven hundred fifty-two thousand, seven hundred twenty-one".