21645005014 has 8 divisors (see below), whose sum is σ = 32912268120. Its totient is φ = 10674248976.

The previous prime is 21645005009. The next prime is 21645005017. The reversal of 21645005014 is 41050054612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21645005017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74126584 + ... + 74126875.

It is an arithmetic number, because the mean of its divisors is an integer number (4114033515).

Almost surely, 2^21645005014 is an apocalyptic number.

21645005014 is a deficient number, since it is larger than the sum of its proper divisors (11267263106).

21645005014 is a wasteful number, since it uses less digits than its factorization.

21645005014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148253534.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21645005014 its reverse (41050054612), we get a palindrome (62695059626).

The spelling of 21645005014 in words is "twenty-one billion, six hundred forty-five million, five thousand, fourteen".