21241642752 has 108 divisors (see below), whose sum is σ = 66812689944. Its totient is φ = 6436853760.

The previous prime is 21241642733. The next prime is 21241642769. The reversal of 21241642752 is 25724614212.

21241642752 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 1 + 642 + 7 + 5 + 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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393723 + ... + 444410.

It is an arithmetic number, because the mean of its divisors is an integer number (618636018).

Almost surely, 2^21241642752 is an apocalyptic number.

21241642752 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21241642752 is an abundant number, since it is smaller than the sum of its proper divisors (45571047192).

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

21241642752 is a wasteful number, since it uses less digits than its factorization.

21241642752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838166 (or 838149 counting only the distinct ones).

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

The spelling of 21241642752 in words is "twenty-one billion, two hundred forty-one million, six hundred forty-two thousand, seven hundred fifty-two".