63432221 has 4 divisors (see below), whose sum is σ = 63461244. Its totient is φ = 63403200.

The previous prime is 63432191. The next prime is 63432247. The reversal of 63432221 is 12223436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 62188996 = 1115^2 + 7886^2 .

It is a cyclic number.

It is not a de Polignac number, because 63432221 - 2¹⁰ = 63431197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63432121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10940 + ... + 15701.

It is an arithmetic number, because the mean of its divisors is an integer number (15865311).

Almost surely, 2^63432221 is an apocalyptic number.

It is an amenable number.

63432221 is a deficient number, since it is larger than the sum of its proper divisors (29023).

63432221 is a wasteful number, since it uses less digits than its factorization.

63432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29022.

The product of its digits is 1728, while the sum is 23.

The square root of 63432221 is about 7964.4347570936. The cubic root of 63432221 is about 398.8136117696.

Adding to 63432221 its reverse (12223436), we get a palindrome (75655657).

The spelling of 63432221 in words is "sixty-three million, four hundred thirty-two thousand, two hundred twenty-one".