212220 has 60 divisors (see below), whose sum is σ = 670824. Its totient is φ = 56160.

The previous prime is 212209. The next prime is 212227. The reversal of 212220 is 22212.

212220 = T₂₀₁ + T₂₀₂ + ... + T₂₁₀.

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212227) by changing a digit.

212220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1555 + ... + 1685.

2²¹²²²⁰ is an apocalyptic number.

212220 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 212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335412).

212220 is an abundant number, since it is smaller than the sum of its proper divisors (458604).

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

212220 is a wasteful number, since it uses less digits than its factorization.

212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 212220 is about 460.6734201145. The cubic root of 212220 is about 59.6479382492.

Adding to 212220 its reverse (22212), we get a palindrome (234432).

The spelling of 212220 in words is "two hundred twelve thousand, two hundred twenty", and thus it is an iban number.