2221243420 has 96 divisors (see below), whose sum is σ = 5171443200. Its totient is φ = 794707200.

The previous prime is 2221243363. The next prime is 2221243421. The reversal of 2221243420 is 243421222.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 2221243391 and 2221243400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221243421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5059561 + ... + 5059999.

It is an arithmetic number, because the mean of its divisors is an integer number (53869200).

Almost surely, 2^2221243420 is an apocalyptic number.

2221243420 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 2221243420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2585721600).

2221243420 is an abundant number, since it is smaller than the sum of its proper divisors (2950199780).

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

2221243420 is a wasteful number, since it uses less digits than its factorization.

2221243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 2221243420 is about 47130.0691703290. The cubic root of 2221243420 is about 1304.7642581955.

Adding to 2221243420 its reverse (243421222), we get a palindrome (2464664642).

The spelling of 2221243420 in words is "two billion, two hundred twenty-one million, two hundred forty-three thousand, four hundred twenty".