21630025424065 has 32 divisors (see below), whose sum is σ = 27634318110720. Its totient is φ = 16227258816000.

The previous prime is 21630025424057. The next prime is 21630025424093. The reversal of 21630025424065 is 56042452003612.

It is a happy number.

It is not a de Polignac number, because 21630025424065 - 2³ = 21630025424057 is a prime.

It is a super-2 number, since 2×21630025424065² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13962820 + ... + 15434389.

It is an arithmetic number, because the mean of its divisors is an integer number (863572440960).

Almost surely, 2^{21630025424065} is an apocalyptic number.

It is an amenable number.

21630025424065 is a deficient number, since it is larger than the sum of its proper divisors (6004292686655).

21630025424065 is a wasteful number, since it uses less digits than its factorization.

21630025424065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29397393.

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 21630025424065 its reverse (56042452003612), we get a palindrome (77672477427677).

The spelling of 21630025424065 in words is "twenty-one trillion, six hundred thirty billion, twenty-five million, four hundred twenty-four thousand, sixty-five".