212128554 has 32 divisors (see below), whose sum is σ = 463348224. Its totient is φ = 64208880.

The previous prime is 212128519. The next prime is 212128573. The reversal of 212128554 is 455821212.

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 15 ways as a sum of consecutive naturals, for example, 100797 + ... + 102879.

It is an arithmetic number, because the mean of its divisors is an integer number (14479632).

Almost surely, 2^212128554 is an apocalyptic number.

212128554 is an abundant number, since it is smaller than the sum of its proper divisors (251219670).

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

212128554 is a wasteful number, since it uses less digits than its factorization.

212128554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642.

The product of its digits is 6400, while the sum is 30.

The square root of 212128554 is about 14564.6336720152. The cubic root of 212128554 is about 596.3936954847.

Adding to 212128554 its reverse (455821212), we get a palindrome (667949766).

The spelling of 212128554 in words is "two hundred twelve million, one hundred twenty-eight thousand, five hundred fifty-four".