128221467 has 8 divisors (see below), whose sum is σ = 186504000. Its totient is φ = 77709960.

The previous prime is 128221453. The next prime is 128221493. The reversal of 128221467 is 764122821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128221467 - 2⁶ = 128221403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 3885499 = 128221467 / (1 + 2 + 8 + 2 + 2 + 1 + 4 + 6 + 7).

It is not an unprimeable number, because it can be changed into a prime (128221447) 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, 1942717 + ... + 1942782.

It is an arithmetic number, because the mean of its divisors is an integer number (23313000).

Almost surely, 2^128221467 is an apocalyptic number.

128221467 is a deficient number, since it is larger than the sum of its proper divisors (58282533).

128221467 is a wasteful number, since it uses less digits than its factorization.

128221467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885513.

The product of its digits is 10752, while the sum is 33.

The square root of 128221467 is about 11323.4918201057. The cubic root of 128221467 is about 504.2589097102.

The spelling of 128221467 in words is "one hundred twenty-eight million, two hundred twenty-one thousand, four hundred sixty-seven".