21240827352 has 48 divisors (see below), whose sum is σ = 57548396880. Its totient is φ = 7077672000.

The previous prime is 21240827351. The next prime is 21240827369. The reversal of 21240827352 is 25372804212.

21240827352 is a `hidden beast` number, since 212 + 408 + 2 + 7 + 35 + 2 = 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 (21240827351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148102 + ... + 253802.

It is an arithmetic number, because the mean of its divisors is an integer number (1198924935).

Almost surely, 2^21240827352 is an apocalyptic number.

It is an amenable number.

21240827352 is an abundant number, since it is smaller than the sum of its proper divisors (36307569528).

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

21240827352 is a wasteful number, since it uses less digits than its factorization.

21240827352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108504 (or 108497 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21240827352 in words is "twenty-one billion, two hundred forty million, eight hundred twenty-seven thousand, three hundred fifty-two".