21628384127999 has 8 divisors (see below), whose sum is σ = 23600686701648. Its totient is φ = 19657095860160.

The previous prime is 21628384127951. The next prime is 21628384128019. The reversal of 21628384127999 is 99972148382612.

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

It is not a de Polignac number, because 21628384127999 - 2⁸ = 21628384127743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21628384627999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253531862 + ... + 253617155.

It is an arithmetic number, because the mean of its divisors is an integer number (2950085837706).

Almost surely, 2^{21628384127999} is an apocalyptic number.

21628384127999 is a deficient number, since it is larger than the sum of its proper divisors (1972302573649).

21628384127999 is a wasteful number, since it uses less digits than its factorization.

21628384127999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507152905.

The product of its digits is 188116992, while the sum is 71.

The spelling of 21628384127999 in words is "twenty-one trillion, six hundred twenty-eight billion, three hundred eighty-four million, one hundred twenty-seven thousand, nine hundred ninety-nine".