21545934750 has 144 divisors (see below), whose sum is σ = 59658122160. Its totient is φ = 5610880800.

The previous prime is 21545934749. The next prime is 21545934803. The reversal of 21545934750 is 5743954512.

21545934750 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 593 + 4 + 7 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21545934696 and 21545934705.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4157661 + ... + 4162839.

It is an arithmetic number, because the mean of its divisors is an integer number (414292515).

Almost surely, 2^21545934750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21545934750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29829061080).

21545934750 is an abundant number, since it is smaller than the sum of its proper divisors (38112187410).

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

21545934750 is a wasteful number, since it uses less digits than its factorization.

21545934750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288 (or 5232 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 21545934750 in words is "twenty-one billion, five hundred forty-five million, nine hundred thirty-four thousand, seven hundred fifty".