21405341652145 has 16 divisors (see below), whose sum is σ = 28021897729728. Its totient is φ = 15567321442240.

The previous prime is 21405341652143. The next prime is 21405341652187. The reversal of 21405341652145 is 54125614350412.

It is not a de Polignac number, because 21405341652145 - 2¹ = 21405341652143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21405341652143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897887 + ... + 6812683.

It is an arithmetic number, because the mean of its divisors is an integer number (1751368608108).

Almost surely, 2^{21405341652145} is an apocalyptic number.

It is an amenable number.

21405341652145 is a deficient number, since it is larger than the sum of its proper divisors (6616556077583).

21405341652145 is a wasteful number, since it uses less digits than its factorization.

21405341652145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994000.

The product of its (nonzero) digits is 576000, while the sum is 43.

The spelling of 21405341652145 in words is "twenty-one trillion, four hundred five billion, three hundred forty-one million, six hundred fifty-two thousand, one hundred forty-five".