3216611221 has 2 divisors, whose sum is σ = 3216611222. Its totient is φ = 3216611220.

The previous prime is 3216611179. The next prime is 3216611261. The reversal of 3216611221 is 1221166123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2215584900 + 1001026321 = 47070^2 + 31639^2 .

It is an emirp because it is prime and its reverse (1221166123) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3216611221 is a prime.

It is a super-2 number, since 2×3216611221² = 20693175494126221682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3216611261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608305610 + 1608305611.

It is an arithmetic number, because the mean of its divisors is an integer number (1608305611).

Almost surely, 2^3216611221 is an apocalyptic number.

It is an amenable number.

3216611221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216611221 is an equidigital number, since it uses as much as digits as its factorization.

3216611221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 3216611221 is about 56715.1762846595. The cubic root of 3216611221 is about 1476.1580442750.

Adding to 3216611221 its reverse (1221166123), we get a palindrome (4437777344).

The spelling of 3216611221 in words is "three billion, two hundred sixteen million, six hundred eleven thousand, two hundred twenty-one".