2163423220 has 192 divisors, whose sum is σ = 5689958400. Its totient is φ = 674472960.

The previous prime is 2163423209. The next prime is 2163423259. The reversal of 2163423220 is 223243612.

2163423220 = 123² + 124² + ... + 1865².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9051861 + ... + 9052099.

It is an arithmetic number, because the mean of its divisors is an integer number (29635200).

Almost surely, 2^2163423220 is an apocalyptic number.

2163423220 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 2163423220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2844979200).

2163423220 is an abundant number, since it is smaller than the sum of its proper divisors (3526535180).

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

2163423220 is a wasteful number, since it uses less digits than its factorization.

2163423220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 2163423220 is about 46512.6135580447. The cubic root of 2163423220 is about 1293.3433335808.

Adding to 2163423220 its reverse (223243612), we get a palindrome (2386666832).

The spelling of 2163423220 in words is "two billion, one hundred sixty-three million, four hundred twenty-three thousand, two hundred twenty".