21455521450433 has 4 divisors (see below), whose sum is σ = 24520595943360. Its totient is φ = 18390446957508.

The previous prime is 21455521450369. The next prime is 21455521450439. The reversal of 21455521450433 is 33405412555412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21455521450433 - 2⁶ = 21455521450369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455521450439) 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 3 ways as a sum of consecutive naturals, for example, 1532537246453 + ... + 1532537246466.

It is an arithmetic number, because the mean of its divisors is an integer number (6130148985840).

Almost surely, 2^{21455521450433} is an apocalyptic number.

It is an amenable number.

21455521450433 is a deficient number, since it is larger than the sum of its proper divisors (3065074492927).

21455521450433 is an equidigital number, since it uses as much as digits as its factorization.

21455521450433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3065074492926.

The product of its (nonzero) digits is 1440000, while the sum is 44.

The spelling of 21455521450433 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred twenty-one million, four hundred fifty thousand, four hundred thirty-three".