It is a Jordan-Polya number, since it can be written as 6! ⋅ 4! ⋅ (2!)7.
It is a tau number, because it is divible by the number of its divisors (120).
It is a congruent number.
It is an unprimeable number.
22211840 is an apocalyptic number.
2211840 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 2211840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3932040).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2211840 is an frugal number, since it uses more digits than its factorization.
2211840 is an evil number, because the sum of its binary digits is even.
The square root of 2211840 is about 1487.2256049436. The cubic root of 2211840 is about 130.2920455966.
Adding to 2211840 its reverse (481122), we get a palindrome (2692962).
The spelling of 2211840 in words is "two million, two hundred eleven thousand, eight hundred forty".