21454445353305 has 16 divisors (see below), whose sum is σ = 34712810461440. Its totient is φ = 11313804889728.

The previous prime is 21454445353303. The next prime is 21454445353333. The reversal of 21454445353305 is 50335354445412.

It is not a de Polignac number, because 21454445353305 - 2¹ = 21454445353303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454445353303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8035371457 + ... + 8035374126.

It is an arithmetic number, because the mean of its divisors is an integer number (2169550653840).

Almost surely, 2^{21454445353305} is an apocalyptic number.

It is an amenable number.

21454445353305 is a deficient number, since it is larger than the sum of its proper divisors (13258365108135).

21454445353305 is a wasteful number, since it uses less digits than its factorization.

21454445353305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16070745680.

The product of its (nonzero) digits is 8640000, while the sum is 48.

Adding to 21454445353305 its reverse (50335354445412), we get a palindrome (71789799798717).

The spelling of 21454445353305 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred forty-five million, three hundred fifty-three thousand, three hundred five".