404102221 has 2 divisors, whose sum is σ = 404102222. Its totient is φ = 404102220.

The previous prime is 404102213. The next prime is 404102227. The reversal of 404102221 is 122201404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 402804900 + 1297321 = 20070^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 404102221 - 2³ = 404102213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404102195 and 404102204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404102227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202051110 + 202051111.

It is an arithmetic number, because the mean of its divisors is an integer number (202051111).

Almost surely, 2^404102221 is an apocalyptic number.

It is an amenable number.

404102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

404102221 is an equidigital number, since it uses as much as digits as its factorization.

404102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 404102221 is about 20102.2939238287. The cubic root of 404102221 is about 739.3165231721.

Adding to 404102221 its reverse (122201404), we get a palindrome (526303625).

The spelling of 404102221 in words is "four hundred four million, one hundred two thousand, two hundred twenty-one".