21840228388 has 24 divisors (see below), whose sum is σ = 42084663264. Its totient is φ = 9834595200.

The previous prime is 21840228383. The next prime is 21840228401. The reversal of 21840228388 is 88382204812.

It is not an unprimeable number, because it can be changed into a prime (21840228383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314773 + ... + 2324188.

It is an arithmetic number, because the mean of its divisors is an integer number (1753527636).

Almost surely, 2^21840228388 is an apocalyptic number.

It is an amenable number.

21840228388 is a deficient number, since it is larger than the sum of its proper divisors (20244434876).

21840228388 is a wasteful number, since it uses less digits than its factorization.

21840228388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639083 (or 4639081 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 46.

The spelling of 21840228388 in words is "twenty-one billion, eight hundred forty million, two hundred twenty-eight thousand, three hundred eighty-eight".