432641021 has 2 divisors, whose sum is σ = 432641022. Its totient is φ = 432641020.

The previous prime is 432641003. The next prime is 432641023. The reversal of 432641021 is 120146234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264420121 + 168220900 = 16261^2 + 12970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-432641021 is a prime.

Together with 432641023, 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 (432641023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216320510 + 216320511.

It is an arithmetic number, because the mean of its divisors is an integer number (216320511).

Almost surely, 2^432641021 is an apocalyptic number.

It is an amenable number.

432641021 is a deficient number, since it is larger than the sum of its proper divisors (1).

432641021 is an equidigital number, since it uses as much as digits as its factorization.

432641021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 432641021 is about 20800.0245432548. The cubic root of 432641021 is about 756.3263506367.

Adding to 432641021 its reverse (120146234), we get a palindrome (552787255).

The spelling of 432641021 in words is "four hundred thirty-two million, six hundred forty-one thousand, twenty-one".