21361073832 has 192 divisors, whose sum is σ = 67199932800. Its totient is φ = 6004039680.

The previous prime is 21361073831. The next prime is 21361073849. The reversal of 21361073832 is 23837016312.

21361073832 is a `hidden beast` number, since 2 + 1 + 3 + 610 + 7 + 3 + 8 + 32 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21361073831) 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 47 ways as a sum of consecutive naturals, for example, 8749732 + ... + 8752172.

It is an arithmetic number, because the mean of its divisors is an integer number (349999650).

Almost surely, 2^21361073832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21361073832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33599966400).

21361073832 is an abundant number, since it is smaller than the sum of its proper divisors (45838858968).

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

21361073832 is a wasteful number, since it uses less digits than its factorization.

21361073832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2729 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 21361073832 in words is "twenty-one billion, three hundred sixty-one million, seventy-three thousand, eight hundred thirty-two".