21654421144323 has 64 divisors (see below), whose sum is σ = 34233810124800. Its totient is φ = 12028857696000.

The previous prime is 21654421144297. The next prime is 21654421144381. The reversal of 21654421144323 is 32344112445612.

It is not a de Polignac number, because 21654421144323 - 2²¹ = 21654419047171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21654421144393) 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 63 ways as a sum of consecutive naturals, for example, 73110258 + ... + 73405848.

It is an arithmetic number, because the mean of its divisors is an integer number (534903283200).

Almost surely, 2^{21654421144323} is an apocalyptic number.

21654421144323 is a deficient number, since it is larger than the sum of its proper divisors (12579388980477).

21654421144323 is a wasteful number, since it uses less digits than its factorization.

21654421144323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299424.

The product of its digits is 552960, while the sum is 42.

Adding to 21654421144323 its reverse (32344112445612), we get a palindrome (53998533589935).

The spelling of 21654421144323 in words is "twenty-one trillion, six hundred fifty-four billion, four hundred twenty-one million, one hundred forty-four thousand, three hundred twenty-three".