21405341652143 has 2 divisors, whose sum is σ = 21405341652144. Its totient is φ = 21405341652142.

The previous prime is 21405341652137. The next prime is 21405341652187. The reversal of 21405341652143 is 34125614350412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21405341652143 - 2⁴ = 21405341652127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21405341652143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21405341652133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702670826071 + 10702670826072.

It is an arithmetic number, because the mean of its divisors is an integer number (10702670826072).

Almost surely, 2^{21405341652143} is an apocalyptic number.

21405341652143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21405341652143 is an equidigital number, since it uses as much as digits as its factorization.

21405341652143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 21405341652143 in words is "twenty-one trillion, four hundred five billion, three hundred forty-one million, six hundred fifty-two thousand, one hundred forty-three".