211218964 has 12 divisors (see below), whose sum is σ = 403236288. Its totient is φ = 96008600.

The previous prime is 211218947. The next prime is 211219013. The reversal of 211218964 is 469812112.

It is a happy number.

It is a super-2 number, since 2×211218964² = 89226901506466592, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2400172 + ... + 2400259.

It is an arithmetic number, because the mean of its divisors is an integer number (33603024).

Almost surely, 2^211218964 is an apocalyptic number.

It is an amenable number.

211218964 is a deficient number, since it is larger than the sum of its proper divisors (192017324).

211218964 is a wasteful number, since it uses less digits than its factorization.

211218964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800446 (or 4800444 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 211218964 is about 14533.3741436736. The cubic root of 211218964 is about 595.5400449590.

The spelling of 211218964 in words is "two hundred eleven million, two hundred eighteen thousand, nine hundred sixty-four".