221232426 has 16 divisors (see below), whose sum is σ = 444759744. Its totient is φ = 73361664.

The previous prime is 221232397. The next prime is 221232437. The reversal of 221232426 is 624232122.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221232396 and 221232405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94366 + ... + 96681.

It is an arithmetic number, because the mean of its divisors is an integer number (27797484).

Almost surely, 2^221232426 is an apocalyptic number.

221232426 is an abundant number, since it is smaller than the sum of its proper divisors (223527318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221232426 is a wasteful number, since it uses less digits than its factorization.

221232426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191245.

The product of its digits is 2304, while the sum is 24.

The square root of 221232426 is about 14873.8840253647. The cubic root of 221232426 is about 604.8062362445.

Adding to 221232426 its reverse (624232122), we get a palindrome (845464548).

The spelling of 221232426 in words is "two hundred twenty-one million, two hundred thirty-two thousand, four hundred twenty-six".