21802855224 has 128 divisors (see below), whose sum is σ = 58059936000. Its totient is φ = 6803564544.

The previous prime is 21802855223. The next prime is 21802855247. The reversal of 21802855224 is 42255820812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21802855223) 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, 14641872 + ... + 14643360.

It is an arithmetic number, because the mean of its divisors is an integer number (453593250).

Almost surely, 2^21802855224 is an apocalyptic number.

21802855224 is a gapful number since it is divisible by the number (24) 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 21802855224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29029968000).

21802855224 is an abundant number, since it is smaller than the sum of its proper divisors (36257080776).

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

21802855224 is a wasteful number, since it uses less digits than its factorization.

21802855224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 39.

The spelling of 21802855224 in words is "twenty-one billion, eight hundred two million, eight hundred fifty-five thousand, two hundred twenty-four".