211864825 has 12 divisors (see below), whose sum is σ = 263516368. Its totient is φ = 168973200.

The previous prime is 211864817. The next prime is 211864831. The reversal of 211864825 is 528468112.

211864825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 211864825 - 2³ = 211864817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4527 + ... + 21076.

Almost surely, 2^211864825 is an apocalyptic number.

211864825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211864825 is a deficient number, since it is larger than the sum of its proper divisors (51651543).

211864825 is a wasteful number, since it uses less digits than its factorization.

211864825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25944 (or 25939 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 211864825 is about 14555.5771098229. The cubic root of 211864825 is about 596.1464373369.

The spelling of 211864825 in words is "two hundred eleven million, eight hundred sixty-four thousand, eight hundred twenty-five".