21522548124 has 288 divisors, whose sum is σ = 71087627520. Its totient is φ = 5568393600.

The previous prime is 21522548111. The next prime is 21522548143. The reversal of 21522548124 is 42184522512.

21522548124 is a `hidden beast` number, since 2 + 1 + 522 + 5 + 4 + 8 + 124 = 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19267614 + ... + 19268730.

It is an arithmetic number, because the mean of its divisors is an integer number (246832040).

Almost surely, 2^21522548124 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 21522548124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35543813760).

21522548124 is an abundant number, since it is smaller than the sum of its proper divisors (49565079396).

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

21522548124 is a wasteful number, since it uses less digits than its factorization.

21522548124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1471 counting only the distinct ones).

The product of its digits is 51200, while the sum is 36.

The spelling of 21522548124 in words is "twenty-one billion, five hundred twenty-two million, five hundred forty-eight thousand, one hundred twenty-four".