128221430 has 16 divisors (see below), whose sum is σ = 231091920. Its totient is φ = 51223392.

The previous prime is 128221421. The next prime is 128221447. The reversal of 128221430 is 34122821.

It is a happy number.

It is a super-2 number, since 2×128221430² = 32881470222489800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128221396 and 128221405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557 + ... + 16023.

It is an arithmetic number, because the mean of its divisors is an integer number (14443245).

Almost surely, 2^128221430 is an apocalyptic number.

128221430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128221430 is a deficient number, since it is larger than the sum of its proper divisors (102870490).

128221430 is a wasteful number, since it uses less digits than its factorization.

128221430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16303.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 128221430 is about 11323.4901863339. The cubic root of 128221430 is about 504.2588612067.

The spelling of 128221430 in words is "one hundred twenty-eight million, two hundred twenty-one thousand, four hundred thirty".