221346426 has 96 divisors (see below), whose sum is σ = 554236992. Its totient is φ = 58544640.

The previous prime is 221346403. The next prime is 221346431. The reversal of 221346426 is 624643122.

It is a junction number, because it is equal to n+sod(n) for n = 221346393 and 221346402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 334536 + ... + 335196.

It is an arithmetic number, because the mean of its divisors is an integer number (5773302).

Almost surely, 2^221346426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221346426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277118496).

221346426 is an abundant number, since it is smaller than the sum of its proper divisors (332890566).

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

221346426 is a wasteful number, since it uses less digits than its factorization.

221346426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 757 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The square root of 221346426 is about 14877.7157520904. The cubic root of 221346426 is about 604.9101029828.

Adding to 221346426 its reverse (624643122), we get a palindrome (845989548).

The spelling of 221346426 in words is "two hundred twenty-one million, three hundred forty-six thousand, four hundred twenty-six".