211390128 has 40 divisors (see below), whose sum is σ = 606769200. Its totient is φ = 70463232.

The previous prime is 211390111. The next prime is 211390141. The reversal of 211390128 is 821093112.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 244233 + ... + 245096.

It is an arithmetic number, because the mean of its divisors is an integer number (15169230).

Almost surely, 2^211390128 is an apocalyptic number.

It is an amenable number.

211390128 is an abundant number, since it is smaller than the sum of its proper divisors (395379072).

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

211390128 is a wasteful number, since it uses less digits than its factorization.

211390128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489346 (or 489334 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 211390128 is about 14539.2616043594. The cubic root of 211390128 is about 595.7008693659.

The spelling of 211390128 in words is "two hundred eleven million, three hundred ninety thousand, one hundred twenty-eight".