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21063136248 = 233271131122557

21063136248 has 192 divisors, whose sum is σ = 73417144320. Its totient is φ = 5294419200.

The previous prime is 21063136243. The next prime is 21063136273. The reversal of 21063136248 is 84263136012.

21063136248 is a `hidden beast` number, since 2 + 10 + 6 + 3 + 13 + 624 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063136243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110586 + ... + 233142.

It is an arithmetic number, because the mean of its divisors is an integer number (382380960).

Almost surely, 221063136248 is an apocalyptic number.

21063136248 is a gapful number since it is divisible by the number (28) 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 21063136248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36708572160).

21063136248 is an abundant number, since it is smaller than the sum of its proper divisors (52354008072).

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

21063136248 is a wasteful number, since it uses less digits than its factorization.

21063136248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122618 (or 122611 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21063136248 in words is "twenty-one billion, sixty-three million, one hundred thirty-six thousand, two hundred forty-eight".