21360413660 has 24 divisors (see below), whose sum is σ = 44859973200. Its totient is φ = 8543574144.

The previous prime is 21360413647. The next prime is 21360413663. The reversal of 21360413660 is 6631406312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360413663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366872 + ... + 421088.

It is an arithmetic number, because the mean of its divisors is an integer number (1869165550).

Almost surely, 2^21360413660 is an apocalyptic number.

21360413660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21360413660 is an abundant number, since it is smaller than the sum of its proper divisors (23499559540).

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

21360413660 is a wasteful number, since it uses less digits than its factorization.

21360413660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73925 (or 73923 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 21360413660 its reverse (6631406312), we get a palindrome (27991819972).

The spelling of 21360413660 in words is "twenty-one billion, three hundred sixty million, four hundred thirteen thousand, six hundred sixty".