221430423220 has 24 divisors (see below), whose sum is σ = 465012977184. Its totient is φ = 88570438176.

The previous prime is 221430423211. The next prime is 221430423223. The reversal of 221430423220 is 22324034122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221430423223) 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, 1593367 + ... + 1726753.

It is an arithmetic number, because the mean of its divisors is an integer number (19375540716).

Almost surely, 2^221430423220 is an apocalyptic number.

221430423220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221430423220 is an abundant number, since it is smaller than the sum of its proper divisors (243582553964).

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

221430423220 is a wasteful number, since it uses less digits than its factorization.

221430423220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216399 (or 216397 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 221430423220 its reverse (22324034122), we get a palindrome (243754457342).

The spelling of 221430423220 in words is "two hundred twenty-one billion, four hundred thirty million, four hundred twenty-three thousand, two hundred twenty".