221433401 has 6 divisors (see below), whose sum is σ = 257585850. Its totient is φ = 189800016.

The previous prime is 221433389. The next prime is 221433427. The reversal of 221433401 is 104334122.

It can be written as a sum of positive squares in only one way, i.e., 220225600 + 1207801 = 14840^2 + 1099^2 .

It is not a de Polignac number, because 221433401 - 2⁶ = 221433337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221433491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2259476 + ... + 2259573.

It is an arithmetic number, because the mean of its divisors is an integer number (42930975).

Almost surely, 2^221433401 is an apocalyptic number.

It is an amenable number.

221433401 is a deficient number, since it is larger than the sum of its proper divisors (36152449).

221433401 is an equidigital number, since it uses as much as digits as its factorization.

221433401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519063 (or 4519056 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221433401 is about 14880.6384607650. The cubic root of 221433401 is about 604.9893229452.

Adding to 221433401 its reverse (104334122), we get a palindrome (325767523).

The spelling of 221433401 in words is "two hundred twenty-one million, four hundred thirty-three thousand, four hundred one".