21325303555 has 16 divisors (see below), whose sum is σ = 27118476000. Its totient is φ = 16070199040.

The previous prime is 21325303541. The next prime is 21325303673. The reversal of 21325303555 is 55530352312.

It is a de Polignac number, because none of the positive numbers 2^k-21325303555 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21325303555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1787605 + ... + 1799494.

It is an arithmetic number, because the mean of its divisors is an integer number (1694904750).

Almost surely, 2^21325303555 is an apocalyptic number.

21325303555 is a deficient number, since it is larger than the sum of its proper divisors (5793172445).

21325303555 is a wasteful number, since it uses less digits than its factorization.

21325303555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587174.

The product of its (nonzero) digits is 67500, while the sum is 34.

Adding to 21325303555 its reverse (55530352312), we get a palindrome (76855655867).

The spelling of 21325303555 in words is "twenty-one billion, three hundred twenty-five million, three hundred three thousand, five hundred fifty-five".