221254220424 has 16 divisors (see below), whose sum is σ = 553135551120. Its totient is φ = 73751406800.

The previous prime is 221254220423. The next prime is 221254220459. The reversal of 221254220424 is 424022452122.

221254220424 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 = 221254220391 and 221254220400.

It is not an unprimeable number, because it can be changed into a prime (221254220423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4609462902 + ... + 4609462949.

It is an arithmetic number, because the mean of its divisors is an integer number (34570971945).

Almost surely, 2^221254220424 is an apocalyptic number.

221254220424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221254220424 is an abundant number, since it is smaller than the sum of its proper divisors (331881330696).

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

221254220424 is a wasteful number, since it uses less digits than its factorization.

221254220424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9218925860 (or 9218925856 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 221254220424 its reverse (424022452122), we get a palindrome (645276672546).

The spelling of 221254220424 in words is "two hundred twenty-one billion, two hundred fifty-four million, two hundred twenty thousand, four hundred twenty-four".