21445453246403 has 4 divisors (see below), whose sum is σ = 22184951634240. Its totient is φ = 20705954858568.

The previous prime is 21445453246397. The next prime is 21445453246411. The reversal of 21445453246403 is 30464235454412.

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 21445453246403 - 2¹² = 21445453242307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21445453246423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369749193875 + ... + 369749193932.

It is an arithmetic number, because the mean of its divisors is an integer number (5546237908560).

Almost surely, 2^{21445453246403} is an apocalyptic number.

21445453246403 is a deficient number, since it is larger than the sum of its proper divisors (739498387837).

21445453246403 is an equidigital number, since it uses as much as digits as its factorization.

21445453246403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739498387836.

The product of its (nonzero) digits is 5529600, while the sum is 47.

The spelling of 21445453246403 in words is "twenty-one trillion, four hundred forty-five billion, four hundred fifty-three million, two hundred forty-six thousand, four hundred three".