21628384128001 has 12 divisors (see below), whose sum is σ = 25535064542448. Its totient is φ = 18261919218312.

The previous prime is 21628384127951. The next prime is 21628384128019. The reversal of 21628384128001 is 10082148382612.

It is not a de Polignac number, because 21628384128001 - 2¹⁵ = 21628384095233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21628384126001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3293993691 + ... + 3294000256.

It is an arithmetic number, because the mean of its divisors is an integer number (2127922045204).

Almost surely, 2^{21628384128001} is an apocalyptic number.

It is an amenable number.

21628384128001 is a deficient number, since it is larger than the sum of its proper divisors (3906680414447).

21628384128001 is an equidigital number, since it uses as much as digits as its factorization.

21628384128001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6587994028 (or 6587994021 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 46.

The spelling of 21628384128001 in words is "twenty-one trillion, six hundred twenty-eight billion, three hundred eighty-four million, one hundred twenty-eight thousand, one".