211309428 has 48 divisors (see below), whose sum is σ = 556436160. Its totient is φ = 61824000.

The previous prime is 211309409. The next prime is 211309433. The reversal of 211309428 is 824903112.

It is a junction number, because it is equal to n+sod(n) for n = 211309395 and 211309404.

It is a congruent number.

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, 23773 + ... + 31428.

It is an arithmetic number, because the mean of its divisors is an integer number (11592420).

Almost surely, 2^211309428 is an apocalyptic number.

It is an amenable number.

211309428 is an abundant number, since it is smaller than the sum of its proper divisors (345126732).

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

211309428 is a wasteful number, since it uses less digits than its factorization.

211309428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55248 (or 55246 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 211309428 is about 14536.4860953395. The cubic root of 211309428 is about 595.6250550736.

The spelling of 211309428 in words is "two hundred eleven million, three hundred nine thousand, four hundred twenty-eight".