21245822592 has 128 divisors (see below), whose sum is σ = 57518208000. Its totient is φ = 6946458624.

The previous prime is 21245822551. The next prime is 21245822593. The reversal of 21245822592 is 29522854212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×21245822592² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21245822593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14929593 + ... + 14931015.

It is an arithmetic number, because the mean of its divisors is an integer number (449361000).

Almost surely, 2^21245822592 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 21245822592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28759104000).

21245822592 is an abundant number, since it is smaller than the sum of its proper divisors (36272385408).

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

21245822592 is a wasteful number, since it uses less digits than its factorization.

21245822592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2146 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The spelling of 21245822592 in words is "twenty-one billion, two hundred forty-five million, eight hundred twenty-two thousand, five hundred ninety-two".