21445425320 has 96 divisors (see below), whose sum is σ = 53709868800. Its totient is φ = 7699486080.

The previous prime is 21445425311. The next prime is 21445425371. The reversal of 21445425320 is 2352454412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 354317 + ... + 410403.

It is an arithmetic number, because the mean of its divisors is an integer number (559477800).

Almost surely, 2^21445425320 is an apocalyptic number.

21445425320 is a gapful number since it is divisible by the number (20) 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 21445425320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26854934400).

21445425320 is an abundant number, since it is smaller than the sum of its proper divisors (32264443480).

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

21445425320 is a wasteful number, since it uses less digits than its factorization.

21445425320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56199 (or 56184 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 21445425320 its reverse (2352454412), we get a palindrome (23797879732).

The spelling of 21445425320 in words is "twenty-one billion, four hundred forty-five million, four hundred twenty-five thousand, three hundred twenty".