211928849 has 4 divisors (see below), whose sum is σ = 231195120. Its totient is φ = 192662580.

The previous prime is 211928807. The next prime is 211928867. The reversal of 211928849 is 948829112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211928849 - 2²⁰ = 210880273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211928879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9633119 + ... + 9633140.

It is an arithmetic number, because the mean of its divisors is an integer number (57798780).

Almost surely, 2^211928849 is an apocalyptic number.

It is an amenable number.

211928849 is a deficient number, since it is larger than the sum of its proper divisors (19266271).

211928849 is a wasteful number, since it uses less digits than its factorization.

211928849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19266270.

The product of its digits is 82944, while the sum is 44.

The square root of 211928849 is about 14557.7762381485. The cubic root of 211928849 is about 596.2064816529.

The spelling of 211928849 in words is "two hundred eleven million, nine hundred twenty-eight thousand, eight hundred forty-nine".