21455450303291 has 4 divisors (see below), whose sum is σ = 22584684529800. Its totient is φ = 20326216076784.

The previous prime is 21455450303233. The next prime is 21455450303293. The reversal of 21455450303291 is 19230305455412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21455450303291 - 2⁶ = 21455450303227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455450303293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564617113226 + ... + 564617113263.

It is an arithmetic number, because the mean of its divisors is an integer number (5646171132450).

Almost surely, 2^{21455450303291} is an apocalyptic number.

21455450303291 is a deficient number, since it is larger than the sum of its proper divisors (1129234226509).

21455450303291 is a wasteful number, since it uses less digits than its factorization.

21455450303291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129234226508.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 21455450303291 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, three hundred three thousand, two hundred ninety-one".