221430246 has 16 divisors (see below), whose sum is σ = 462115584. Its totient is φ = 70600904.

The previous prime is 221430239. The next prime is 221430247. The reversal of 221430246 is 642034122.

221430246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221430247) 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, 802146 + ... + 802421.

It is an arithmetic number, because the mean of its divisors is an integer number (28882224).

Almost surely, 2^221430246 is an apocalyptic number.

221430246 is an abundant number, since it is smaller than the sum of its proper divisors (240685338).

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

221430246 is a wasteful number, since it uses less digits than its factorization.

221430246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604595.

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

The square root of 221430246 is about 14880.5324501511. The cubic root of 221430246 is about 604.9864496202.

Adding to 221430246 its reverse (642034122), we get a palindrome (863464368).

The spelling of 221430246 in words is "two hundred twenty-one million, four hundred thirty thousand, two hundred forty-six".