2111220 has 72 divisors (see below), whose sum is σ = 6597864. Its totient is φ = 546048.

The previous prime is 2111189. The next prime is 2111231. The reversal of 2111220 is 221112.

It can be written as a sum of positive squares in 4 ways, for example, as 156816 + 1954404 = 396^2 + 1398^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6502 + ... + 6818.

It is an arithmetic number, because the mean of its divisors is an integer number (91637).

2^2111220 is an apocalyptic number.

2111220 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 2111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3298932).

2111220 is an abundant number, since it is smaller than the sum of its proper divisors (4486644).

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

2111220 is a wasteful number, since it uses less digits than its factorization.

2111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2111220 is about 1453.0037852669. The cubic root of 2111220 is about 128.2855765784.

Adding to 2111220 its reverse (221112), we get a palindrome (2332332).

It can be divided in two parts, 211 and 1220, that added together give a triangular number (1431 = T₅₃).

The spelling of 2111220 in words is "two million, one hundred eleven thousand, two hundred twenty".