212128919 has 8 divisors (see below), whose sum is σ = 214915680. Its totient is φ = 209351296.

The previous prime is 212128879. The next prime is 212128937. The reversal of 212128919 is 919821212.

212128919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212128919 - 2¹² = 212124823 is a prime.

It is a super-2 number, since 2×212128919² = 89997356552217122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212128019) 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, 52982 + ... + 56844.

It is an arithmetic number, because the mean of its divisors is an integer number (26864460).

Almost surely, 2^212128919 is an apocalyptic number.

212128919 is a deficient number, since it is larger than the sum of its proper divisors (2786761).

212128919 is an equidigital number, since it uses as much as digits as its factorization.

212128919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569.

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

The square root of 212128919 is about 14564.6462023628. The cubic root of 212128919 is about 596.3940375471.

The spelling of 212128919 in words is "two hundred twelve million, one hundred twenty-eight thousand, nine hundred nineteen".