221234430 has 64 divisors (see below), whose sum is σ = 563915520. Its totient is φ = 55355904.

The previous prime is 221234407. The next prime is 221234437. The reversal of 221234430 is 34432122.

It is a junction number, because it is equal to n+sod(n) for n = 221234397 and 221234406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221234437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299001 + ... + 299739.

It is an arithmetic number, because the mean of its divisors is an integer number (8811180).

Almost surely, 2^221234430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221234430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281957760).

221234430 is an abundant number, since it is smaller than the sum of its proper divisors (342681090).

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

221234430 is a wasteful number, since it uses less digits than its factorization.

221234430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221234430 is about 14873.9513916108. The cubic root of 221234430 is about 604.8080624205.

Adding to 221234430 its reverse (34432122), we get a palindrome (255666552).

The spelling of 221234430 in words is "two hundred twenty-one million, two hundred thirty-four thousand, four hundred thirty".