211428 has 36 divisors (see below), whose sum is σ = 611520. Its totient is φ = 60336.

The previous prime is 211427. The next prime is 211433. The reversal of 211428 is 824112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 211428.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 211428.

It is not an unprimeable number, because it can be changed into a prime (211427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168 + ... + 671.

2²¹¹⁴²⁸ is an apocalyptic number.

211428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

211428 is an abundant number, since it is smaller than the sum of its proper divisors (400092).

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

211428 is a wasteful number, since it uses less digits than its factorization.

211428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 851 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 211428 is about 459.8130054707. The cubic root of 211428 is about 59.5736441882.

The spelling of 211428 in words is "two hundred eleven thousand, four hundred twenty-eight".