211145440 has 96 divisors (see below), whose sum is σ = 576271584. Its totient is φ = 72253440.

The previous prime is 211145411. The next prime is 211145489. The reversal of 211145440 is 44541112.

It is a super-3 number, since 3×211145440³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

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 15 ways as a sum of consecutive naturals, for example, 26392 + ... + 33448.

It is an arithmetic number, because the mean of its divisors is an integer number (6002829).

Almost surely, 2^211145440 is an apocalyptic number.

211145440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211145440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288135792).

211145440 is an abundant number, since it is smaller than the sum of its proper divisors (365126144).

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

211145440 is a wasteful number, since it uses less digits than its factorization.

211145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100 (or 7092 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 211145440 is about 14530.8444352006. The cubic root of 211145440 is about 595.4709356849.

Adding to 211145440 its reverse (44541112), we get a palindrome (255686552).

The spelling of 211145440 in words is "two hundred eleven million, one hundred forty-five thousand, four hundred forty".