21451400344443 has 8 divisors (see below), whose sum is σ = 28601894019856. Its totient is φ = 14300920116000.

The previous prime is 21451400344391. The next prime is 21451400344477. The reversal of 21451400344443 is 34444300415412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21451400344443 - 2¹⁰ = 21451400343419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21451400324443) 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 7 ways as a sum of consecutive naturals, for example, 1273593 + ... + 6672693.

It is an arithmetic number, because the mean of its divisors is an integer number (3575236752482).

Almost surely, 2^{21451400344443} is an apocalyptic number.

21451400344443 is a deficient number, since it is larger than the sum of its proper divisors (7150493675413).

21451400344443 is a wasteful number, since it uses less digits than its factorization.

21451400344443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6723485.

The product of its (nonzero) digits is 368640, while the sum is 39.

Adding to 21451400344443 its reverse (34444300415412), we get a palindrome (55895700759855).

The spelling of 21451400344443 in words is "twenty-one trillion, four hundred fifty-one billion, four hundred million, three hundred forty-four thousand, four hundred forty-three".