423400221 has 12 divisors (see below), whose sum is σ = 612617148. Its totient is φ = 281787264.

The previous prime is 423400217. The next prime is 423400223. The reversal of 423400221 is 122004324.

423400221 is a `hidden beast` number, since 42 + 3 + 400 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 227708100 + 195692121 = 15090^2 + 13989^2 .

It is not a de Polignac number, because 423400221 - 2² = 423400217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 423400194 and 423400203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423400223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34330 + ... + 45003.

It is an arithmetic number, because the mean of its divisors is an integer number (51051429).

Almost surely, 2^423400221 is an apocalyptic number.

It is an amenable number.

423400221 is a deficient number, since it is larger than the sum of its proper divisors (189216927).

423400221 is a wasteful number, since it uses less digits than its factorization.

423400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79932 (or 79929 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 423400221 is about 20576.6912063140. The cubic root of 423400221 is about 750.9027476263.

Adding to 423400221 its reverse (122004324), we get a palindrome (545404545).

The spelling of 423400221 in words is "four hundred twenty-three million, four hundred thousand, two hundred twenty-one".