21522724608 has 576 divisors, whose sum is σ = 76857016320. Its totient is φ = 5175705600.

The previous prime is 21522724577. The next prime is 21522724627. The reversal of 21522724608 is 80642722512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79419513 + ... + 79419783.

It is an arithmetic number, because the mean of its divisors is an integer number (133432320).

Almost surely, 2^21522724608 is an apocalyptic number.

21522724608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21522724608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38428508160).

21522724608 is an abundant number, since it is smaller than the sum of its proper divisors (55334291712).

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

21522724608 is a wasteful number, since it uses less digits than its factorization.

21522724608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The spelling of 21522724608 in words is "twenty-one billion, five hundred twenty-two million, seven hundred twenty-four thousand, six hundred eight".