21450611105423 has 4 divisors (see below), whose sum is σ = 21619513555200. Its totient is φ = 21281708655648.

The previous prime is 21450611105401. The next prime is 21450611105447. The reversal of 21450611105423 is 32450111605412.

It is a happy number.

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 21450611105423 - 2²⁶ = 21450543996559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450611105453) 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, 84451224698 + ... + 84451224951.

It is an arithmetic number, because the mean of its divisors is an integer number (5404878388800).

Almost surely, 2^{21450611105423} is an apocalyptic number.

21450611105423 is a deficient number, since it is larger than the sum of its proper divisors (168902449777).

21450611105423 is a wasteful number, since it uses less digits than its factorization.

21450611105423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168902449776.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21450611105423 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred twenty-three".