21368282544 has 160 divisors (see below), whose sum is σ = 70325498880. Its totient is φ = 6085324800.

The previous prime is 21368282539. The next prime is 21368282561. The reversal of 21368282544 is 44528286312.

21368282544 is a `hidden beast` number, since 2 + 1 + 368 + 282 + 5 + 4 + 4 = 666.

It is a super-2 number, since 2×21368282544² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21368282544.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 929104 + ... + 951824.

It is an arithmetic number, because the mean of its divisors is an integer number (439534368).

Almost surely, 2^21368282544 is an apocalyptic number.

21368282544 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 21368282544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35162749440).

21368282544 is an abundant number, since it is smaller than the sum of its proper divisors (48957216336).

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

21368282544 is a wasteful number, since it uses less digits than its factorization.

21368282544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23056 (or 23044 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The spelling of 21368282544 in words is "twenty-one billion, three hundred sixty-eight million, two hundred eighty-two thousand, five hundred forty-four".