21464245632064 has 56 divisors (see below), whose sum is σ = 42663294940448. Its totient is φ = 10714442158080.

The previous prime is 21464245632061. The next prime is 21464245632077. The reversal of 21464245632064 is 46023654246412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21464245631999 and 21464245632017.

It is not an unprimeable number, because it can be changed into a prime (21464245632061) 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, 675576499 + ... + 675608269.

It is an arithmetic number, because the mean of its divisors is an integer number (761844552508).

Almost surely, 2^{21464245632064} is an apocalyptic number.

It is an amenable number.

21464245632064 is a deficient number, since it is larger than the sum of its proper divisors (21199049308384).

21464245632064 is a wasteful number, since it uses less digits than its factorization.

21464245632064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48843 (or 48833 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 49.

Adding to 21464245632064 its reverse (46023654246412), we get a palindrome (67487899878476).

The spelling of 21464245632064 in words is "twenty-one trillion, four hundred sixty-four billion, two hundred forty-five million, six hundred thirty-two thousand, sixty-four".