404132221 has 2 divisors, whose sum is σ = 404132222. Its totient is φ = 404132220.

The previous prime is 404132219. The next prime is 404132227. The reversal of 404132221 is 122231404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216825625 + 187306596 = 14725^2 + 13686^2 .

It is a cyclic number.

It is not a de Polignac number, because 404132221 - 2¹ = 404132219 is a prime.

Together with 404132219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404132227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202066110 + 202066111.

It is an arithmetic number, because the mean of its divisors is an integer number (202066111).

Almost surely, 2^404132221 is an apocalyptic number.

It is an amenable number.

404132221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404132221 is an equidigital number, since it uses as much as digits as its factorization.

404132221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 404132221 is about 20103.0400934784. The cubic root of 404132221 is about 739.3348180043.

Adding to 404132221 its reverse (122231404), we get a palindrome (526363625).

The spelling of 404132221 in words is "four hundred four million, one hundred thirty-two thousand, two hundred twenty-one".