21804520248 has 192 divisors, whose sum is σ = 70167202560. Its totient is φ = 6214081536.

The previous prime is 21804520219. The next prime is 21804520259. The reversal of 21804520248 is 84202540812.

21804520248 is a `hidden beast` number, since 2 + 180 + 452 + 0 + 24 + 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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6026536 + ... + 6030152.

It is an arithmetic number, because the mean of its divisors is an integer number (365454180).

Almost surely, 2^21804520248 is an apocalyptic number.

21804520248 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 21804520248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35083601280).

21804520248 is an abundant number, since it is smaller than the sum of its proper divisors (48362682312).

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

21804520248 is a wasteful number, since it uses less digits than its factorization.

21804520248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4072 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The spelling of 21804520248 in words is "twenty-one billion, eight hundred four million, five hundred twenty thousand, two hundred forty-eight".