421132221 has 6 divisors (see below), whose sum is σ = 608302110. Its totient is φ = 280754808.

The previous prime is 421132213. The next prime is 421132237. The reversal of 421132221 is 122231124.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 420824196 + 308025 = 20514^2 + 555^2 .

It is not a de Polignac number, because 421132221 - 2³ = 421132213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 421132194 and 421132203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421132121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23396226 + ... + 23396243.

It is an arithmetic number, because the mean of its divisors is an integer number (101383685).

Almost surely, 2^421132221 is an apocalyptic number.

It is an amenable number.

421132221 is a deficient number, since it is larger than the sum of its proper divisors (187169889).

421132221 is a wasteful number, since it uses less digits than its factorization.

421132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46792475 (or 46792472 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 421132221 is about 20521.5063043627. The cubic root of 421132221 is about 749.5595760863.

Adding to 421132221 its reverse (122231124), we get a palindrome (543363345).

The spelling of 421132221 in words is "four hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty-one".