2236221820 has 72 divisors (see below), whose sum is σ = 5784152976. Its totient is φ = 721598976.

The previous prime is 2236221809. The next prime is 2236221821. The reversal of 2236221820 is 281226322.

It is a happy number.

It is a super-2 number, since 2×2236221820² = 10001376056488224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2236221821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50454 + ... + 83773.

It is an arithmetic number, because the mean of its divisors is an integer number (80335458).

Almost surely, 2^2236221820 is an apocalyptic number.

2236221820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2236221820 is an abundant number, since it is smaller than the sum of its proper divisors (3547931156).

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

2236221820 is a wasteful number, since it uses less digits than its factorization.

2236221820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134267 (or 134258 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 2236221820 is about 47288.7071085687. The cubic root of 2236221820 is about 1307.6904745374.

The spelling of 2236221820 in words is "two billion, two hundred thirty-six million, two hundred twenty-one thousand, eight hundred twenty".