21522804750 has 96 divisors (see below), whose sum is σ = 58248410688. Its totient is φ = 5734411200.

The previous prime is 21522804727. The next prime is 21522804757. The reversal of 21522804750 is 5740822512.

It is a happy number.

21522804750 is a `hidden beast` number, since 2 + 1 + 522 + 80 + 4 + 7 + 50 = 666.

It is a super-2 number, since 2×21522804750² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522804757) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3085767 + ... + 3092733.

It is an arithmetic number, because the mean of its divisors is an integer number (606754278).

Almost surely, 2^21522804750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21522804750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29124205344).

21522804750 is an abundant number, since it is smaller than the sum of its proper divisors (36725605938).

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

21522804750 is a wasteful number, since it uses less digits than its factorization.

21522804750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363 (or 8350 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 21522804750 in words is "twenty-one billion, five hundred twenty-two million, eight hundred four thousand, seven hundred fifty".