221544426 has 8 divisors (see below), whose sum is σ = 443088864. Its totient is φ = 73848140.

The previous prime is 221544413. The next prime is 221544431. The reversal of 221544426 is 624445122.

It is a sphenic number, since it is the product of 3 distinct primes.

221544426 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 221544393 and 221544402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18462030 + ... + 18462041.

It is an arithmetic number, because the mean of its divisors is an integer number (55386108).

Almost surely, 2^221544426 is an apocalyptic number.

221544426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221544426 is a wasteful number, since it uses less digits than its factorization.

221544426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36924076.

The product of its digits is 15360, while the sum is 30.

The square root of 221544426 is about 14884.3685119658. The cubic root of 221544426 is about 605.0904183783.

Adding to 221544426 its reverse (624445122), we get a palindrome (845989548).

The spelling of 221544426 in words is "two hundred twenty-one million, five hundred forty-four thousand, four hundred twenty-six".