3220610721 has 16 divisors (see below), whose sum is σ = 4517778048. Its totient is φ = 2038089600.

The previous prime is 3220610707. The next prime is 3220610761. The reversal of 3220610721 is 1270160223.

It is not a de Polignac number, because 3220610721 - 2⁷ = 3220610593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3220610691 and 3220610700.

It is not an unprimeable number, because it can be changed into a prime (3220610761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349285 + ... + 358386.

It is an arithmetic number, because the mean of its divisors is an integer number (282361128).

Almost surely, 2^3220610721 is an apocalyptic number.

It is an amenable number.

3220610721 is a deficient number, since it is larger than the sum of its proper divisors (1297167327).

3220610721 is a wasteful number, since it uses less digits than its factorization.

3220610721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707752.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 3220610721 is about 56750.4248530352. The cubic root of 3220610721 is about 1476.7696039191.

Adding to 3220610721 its reverse (1270160223), we get a palindrome (4490770944).

The spelling of 3220610721 in words is "three billion, two hundred twenty million, six hundred ten thousand, seven hundred twenty-one".