2016212220 has 144 divisors (see below), whose sum is σ = 6798066912. Its totient is φ = 479531520.

The previous prime is 2016212207. The next prime is 2016212279. The reversal of 2016212220 is 222126102.

2016212220 is a `hidden beast` number, since 2 + 0 + 1 + 621 + 22 + 20 = 666.

It is a super-2 number, since 2×2016212220² = 8130223432154656800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2016212193 and 2016212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95334 + ... + 114546.

It is an arithmetic number, because the mean of its divisors is an integer number (47208798).

Almost surely, 2^2016212220 is an apocalyptic number.

2016212220 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 2016212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3399033456).

2016212220 is an abundant number, since it is smaller than the sum of its proper divisors (4781854692).

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

2016212220 is a wasteful number, since it uses less digits than its factorization.

2016212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19292 (or 19287 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2016212220 is about 44902.2518366284. The cubic root of 2016212220 is about 1263.3162452853.

Adding to 2016212220 its reverse (222126102), we get a palindrome (2238338322).

It can be divided in two parts, 201621 and 2220, that added together give a triangular number (203841 = T₆₃₈).

The spelling of 2016212220 in words is "two billion, sixteen million, two hundred twelve thousand, two hundred twenty".