32216621 has 2 divisors, whose sum is σ = 32216622. Its totient is φ = 32216620.

The previous prime is 32216617. The next prime is 32216623. The reversal of 32216621 is 12661223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17547721 + 14668900 = 4189^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 32216621 - 2² = 32216617 is a prime.

Together with 32216623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32216623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16108310 + 16108311.

It is an arithmetic number, because the mean of its divisors is an integer number (16108311).

Almost surely, 2^32216621 is an apocalyptic number.

It is an amenable number.

32216621 is a deficient number, since it is larger than the sum of its proper divisors (1).

32216621 is an equidigital number, since it uses as much as digits as its factorization.

32216621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 32216621 is about 5675.9687278913. The cubic root of 32216621 is about 318.1949841206.

Adding to 32216621 its reverse (12661223), we get a palindrome (44877844).

The spelling of 32216621 in words is "thirty-two million, two hundred sixteen thousand, six hundred twenty-one".