21105454545141 has 16 divisors (see below), whose sum is σ = 28540122121728. Its totient is φ = 13870589020400.

The previous prime is 21105454545083. The next prime is 21105454545167. The reversal of 21105454545141 is 14154545450112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21105454545141 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21105454545093 and 21105454545102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105454645141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3578751 + ... + 7417436.

It is an arithmetic number, because the mean of its divisors is an integer number (1783757632608).

Almost surely, 2^{21105454545141} is an apocalyptic number.

It is an amenable number.

21105454545141 is a deficient number, since it is larger than the sum of its proper divisors (7434667576587).

21105454545141 is a wasteful number, since it uses less digits than its factorization.

21105454545141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11005272.

The product of its (nonzero) digits is 320000, while the sum is 42.

Adding to 21105454545141 its reverse (14154545450112), we get a palindrome (35259999995253).

The spelling of 21105454545141 in words is "twenty-one trillion, one hundred five billion, four hundred fifty-four million, five hundred forty-five thousand, one hundred forty-one".