128921219 has 8 divisors (see below), whose sum is σ = 152091648. Its totient is φ = 106939080.

The previous prime is 128921203. The next prime is 128921227. The reversal of 128921219 is 912129821.

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

It is a cyclic number.

It is not a de Polignac number, because 128921219 - 2⁴ = 128921203 is a prime.

It is a super-2 number, since 2×128921219² = 33241361416891922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128921239) 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, 296837 + ... + 297270.

It is an arithmetic number, because the mean of its divisors is an integer number (19011456).

Almost surely, 2^128921219 is an apocalyptic number.

128921219 is a deficient number, since it is larger than the sum of its proper divisors (23170429).

128921219 is an equidigital number, since it uses as much as digits as its factorization.

128921219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594145.

The product of its digits is 5184, while the sum is 35.

The square root of 128921219 is about 11354.3480217932. The cubic root of 128921219 is about 505.1745552179.

The spelling of 128921219 in words is "one hundred twenty-eight million, nine hundred twenty-one thousand, two hundred nineteen".