21628468592641 has 2 divisors, whose sum is σ = 21628468592642. Its totient is φ = 21628468592640.

The previous prime is 21628468592639. The next prime is 21628468592671. The reversal of 21628468592641 is 14629586482612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19606555229041 + 2021913363600 = 4427929^2 + 1421940^2 .

It is a cyclic number.

It is not a de Polignac number, because 21628468592641 - 2¹ = 21628468592639 is a prime.

Together with 21628468592639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21628468592671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10814234296320 + 10814234296321.

It is an arithmetic number, because the mean of its divisors is an integer number (10814234296321).

Almost surely, 2^{21628468592641} is an apocalyptic number.

It is an amenable number.

21628468592641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21628468592641 is an equidigital number, since it uses as much as digits as its factorization.

21628468592641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79626240, while the sum is 64.

The spelling of 21628468592641 in words is "twenty-one trillion, six hundred twenty-eight billion, four hundred sixty-eight million, five hundred ninety-two thousand, six hundred forty-one".