211640069 has 24 divisors (see below), whose sum is σ = 234983520. Its totient is φ = 190032480.

The previous prime is 211640041. The next prime is 211640083. The reversal of 211640069 is 960046112.

It is a de Polignac number, because none of the positive numbers 2^k-211640069 is a prime.

It is a super-2 number, since 2×211640069² = 89583037612649522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211640369) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1223267 + ... + 1223439.

It is an arithmetic number, because the mean of its divisors is an integer number (9790980).

Almost surely, 2^211640069 is an apocalyptic number.

It is an amenable number.

211640069 is a deficient number, since it is larger than the sum of its proper divisors (23343451).

211640069 is a wasteful number, since it uses less digits than its factorization.

211640069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 211640069 is about 14547.8544466186. The cubic root of 211640069 is about 595.9355561824.

The spelling of 211640069 in words is "two hundred eleven million, six hundred forty thousand, sixty-nine".