201432821 has 2 divisors, whose sum is σ = 201432822. Its totient is φ = 201432820.

The previous prime is 201432809. The next prime is 201432839. The reversal of 201432821 is 128234102.

It is a happy number.

201432821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188073796 + 13359025 = 13714^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 201432821 - 2⁶ = 201432757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201432841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100716410 + 100716411.

It is an arithmetic number, because the mean of its divisors is an integer number (100716411).

Almost surely, 2^201432821 is an apocalyptic number.

It is an amenable number.

201432821 is a deficient number, since it is larger than the sum of its proper divisors (1).

201432821 is an equidigital number, since it uses as much as digits as its factorization.

201432821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 201432821 is about 14192.7030899685. The cubic root of 201432821 is about 586.1967572270.

Adding to 201432821 its reverse (128234102), we get a palindrome (329666923).

The spelling of 201432821 in words is "two hundred one million, four hundred thirty-two thousand, eight hundred twenty-one".