211865340 has 24 divisors (see below), whose sum is σ = 593223120. Its totient is φ = 56497408.

The previous prime is 211865321. The next prime is 211865347. The reversal of 211865340 is 43568112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 211865298 and 211865307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211865347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1765485 + ... + 1765604.

It is an arithmetic number, because the mean of its divisors is an integer number (24717630).

Almost surely, 2^211865340 is an apocalyptic number.

211865340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211865340 is an abundant number, since it is smaller than the sum of its proper divisors (381357780).

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

211865340 is a wasteful number, since it uses less digits than its factorization.

211865340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531101 (or 3531099 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 211865340 is about 14555.5948006256. The cubic root of 211865340 is about 596.1469203731.

The spelling of 211865340 in words is "two hundred eleven million, eight hundred sixty-five thousand, three hundred forty".