221230543420 has 48 divisors (see below), whose sum is σ = 476875790496. Its totient is φ = 86179680000.

The previous prime is 221230543379. The next prime is 221230543421. The reversal of 221230543420 is 24345032122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221230543421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774486 + ... + 1020925.

It is an arithmetic number, because the mean of its divisors is an integer number (9934912302).

Almost surely, 2^221230543420 is an apocalyptic number.

221230543420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221230543420 is an abundant number, since it is smaller than the sum of its proper divisors (255645247076).

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

221230543420 is a wasteful number, since it uses less digits than its factorization.

221230543420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795582 (or 1795580 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 221230543420 its reverse (24345032122), we get a palindrome (245575575542).

The spelling of 221230543420 in words is "two hundred twenty-one billion, two hundred thirty million, five hundred forty-three thousand, four hundred twenty".