211908928 has 84 divisors (see below), whose sum is σ = 533716992. Its totient is φ = 82548480.

The previous prime is 211908871. The next prime is 211908929. The reversal of 211908928 is 829809112.

It is a super-2 number, since 2×211908928² = 89810787532218368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211908929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31425 + ... + 37567.

Almost surely, 2^211908928 is an apocalyptic number.

211908928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211908928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266858496).

211908928 is an abundant number, since it is smaller than the sum of its proper divisors (321808064).

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

211908928 is a wasteful number, since it uses less digits than its factorization.

211908928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180 (or 6163 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 211908928 is about 14557.0920172952. The cubic root of 211908928 is about 596.1878002235.

The spelling of 211908928 in words is "two hundred eleven million, nine hundred eight thousand, nine hundred twenty-eight".