3216261321 has 24 divisors (see below), whose sum is σ = 5717799360. Its totient is φ = 1696489056.

The previous prime is 3216261317. The next prime is 3216261329. The reversal of 3216261321 is 1231626123.

3216261321 is a `hidden beast` number, since 3 + 2 + 1 + 626 + 1 + 32 + 1 = 666.

3216261321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3216261321 - 2² = 3216261317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3216261329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1962711 + ... + 1964348.

It is an arithmetic number, because the mean of its divisors is an integer number (238241640).

Almost surely, 2^3216261321 is an apocalyptic number.

It is an amenable number.

3216261321 is a deficient number, since it is larger than the sum of its proper divisors (2501538039).

3216261321 is a wasteful number, since it uses less digits than its factorization.

3216261321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927085 (or 3927082 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 3216261321 is about 56712.0914885001. The cubic root of 3216261321 is about 1476.1045172975.

Adding to 3216261321 its reverse (1231626123), we get a palindrome (4447887444).

The spelling of 3216261321 in words is "three billion, two hundred sixteen million, two hundred sixty-one thousand, three hundred twenty-one".