21354521524433 has 16 divisors (see below), whose sum is σ = 22130289858240. Its totient is φ = 20592693610944.

The previous prime is 21354521524421. The next prime is 21354521524447. The reversal of 21354521524433 is 33442512545312.

It is a cyclic number.

It is not a de Polignac number, because 21354521524433 - 2¹⁴ = 21354521508049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354521524493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16392935 + ... + 17647587.

It is an arithmetic number, because the mean of its divisors is an integer number (1383143116140).

Almost surely, 2^{21354521524433} is an apocalyptic number.

It is an amenable number.

21354521524433 is a deficient number, since it is larger than the sum of its proper divisors (775768333807).

21354521524433 is a wasteful number, since it uses less digits than its factorization.

21354521524433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260208.

The product of its digits is 1728000, while the sum is 44.

The spelling of 21354521524433 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred twenty-one million, five hundred twenty-four thousand, four hundred thirty-three".