221423430 has 16 divisors (see below), whose sum is σ = 531416304. Its totient is φ = 59046240.

The previous prime is 221423417. The next prime is 221423431. The reversal of 221423430 is 34324122.

221423430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221423397 and 221423406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221423431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3690361 + ... + 3690420.

It is an arithmetic number, because the mean of its divisors is an integer number (33213519).

Almost surely, 2^221423430 is an apocalyptic number.

221423430 is an abundant number, since it is smaller than the sum of its proper divisors (309992874).

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

221423430 is a wasteful number, since it uses less digits than its factorization.

221423430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380791.

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

The square root of 221423430 is about 14880.3034243257. The cubic root of 221423430 is about 604.9802420522.

Adding to 221423430 its reverse (34324122), we get a palindrome (255747552).

The spelling of 221423430 in words is "two hundred twenty-one million, four hundred twenty-three thousand, four hundred thirty".