2212820 has 12 divisors (see below), whose sum is σ = 4646964. Its totient is φ = 885120.

The previous prime is 2212817. The next prime is 2212831. The reversal of 2212820 is 282122.

It can be written as a sum of positive squares in 2 ways, for example, as 894916 + 1317904 = 946^2 + 1148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55301 + ... + 55340.

It is an arithmetic number, because the mean of its divisors is an integer number (387247).

2^2212820 is an apocalyptic number.

2212820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2212820 is an abundant number, since it is smaller than the sum of its proper divisors (2434144).

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

2212820 is a wasteful number, since it uses less digits than its factorization.

2212820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110650 (or 110648 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2212820 is about 1487.5550409985. Note that the first 3 decimals coincide. The cubic root of 2212820 is about 130.3112855885.

Adding to 2212820 its reverse (282122), we get a palindrome (2494942).

The spelling of 2212820 in words is "two million, two hundred twelve thousand, eight hundred twenty".