21245103560 has 128 divisors (see below), whose sum is σ = 49746493440. Its totient is φ = 8160768000.

The previous prime is 21245103547. The next prime is 21245103571. The reversal of 21245103560 is 6530154212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24114320 + ... + 24115200.

It is an arithmetic number, because the mean of its divisors is an integer number (388644480).

Almost surely, 2^21245103560 is an apocalyptic number.

21245103560 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 21245103560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24873246720).

21245103560 is an abundant number, since it is smaller than the sum of its proper divisors (28501389880).

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

21245103560 is a wasteful number, since it uses less digits than its factorization.

21245103560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21245103560 its reverse (6530154212), we get a palindrome (27775257772).

The spelling of 21245103560 in words is "twenty-one billion, two hundred forty-five million, one hundred three thousand, five hundred sixty".