21868252224 has 224 divisors, whose sum is σ = 71497789440. Its totient is φ = 5744314368.

The previous prime is 21868252207. The next prime is 21868252229. The reversal of 21868252224 is 42225286812.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21868252229) 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, 4592757 + ... + 4597515.

It is an arithmetic number, because the mean of its divisors is an integer number (319186560).

Almost surely, 2^21868252224 is an apocalyptic number.

21868252224 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 21868252224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35748894720).

21868252224 is an abundant number, since it is smaller than the sum of its proper divisors (49629537216).

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

21868252224 is a wasteful number, since it uses less digits than its factorization.

21868252224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057 (or 5047 counting only the distinct ones).

The product of its digits is 245760, while the sum is 42.

The spelling of 21868252224 in words is "twenty-one billion, eight hundred sixty-eight million, two hundred fifty-two thousand, two hundred twenty-four".