32231621 has 2 divisors, whose sum is σ = 32231622. Its totient is φ = 32231620.

The previous prime is 32231611. The next prime is 32231651. The reversal of 32231621 is 12613223.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30129121 + 2102500 = 5489^2 + 1450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32231621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 32231593 and 32231602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32231611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16115810 + 16115811.

It is an arithmetic number, because the mean of its divisors is an integer number (16115811).

It is a self-describing number.

Almost surely, 2^32231621 is an apocalyptic number.

It is an amenable number.

32231621 is a deficient number, since it is larger than the sum of its proper divisors (1).

32231621 is an equidigital number, since it uses as much as digits as its factorization.

32231621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 20.

The square root of 32231621 is about 5677.2899344670. The cubic root of 32231621 is about 318.2443601265.

Adding to 32231621 its reverse (12613223), we get a palindrome (44844844).

The spelling of 32231621 in words is "thirty-two million, two hundred thirty-one thousand, six hundred twenty-one".