21043312401344 has 28 divisors (see below), whose sum is σ = 42776306540688. Its totient is φ = 10265030438400.

The previous prime is 21043312401341. The next prime is 21043312401347. The reversal of 21043312401344 is 44310421334012.

It is an interprime number because it is at equal distance from previous prime (21043312401341) and next prime (21043312401347).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21043312401344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043312401341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4009774892 + ... + 4009780139.

It is an arithmetic number, because the mean of its divisors is an integer number (1527725233596).

Almost surely, 2^{21043312401344} is an apocalyptic number.

It is an amenable number.

21043312401344 is an abundant number, since it is smaller than the sum of its proper divisors (21732994139344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21043312401344 is an equidigital number, since it uses as much as digits as its factorization.

21043312401344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8019555084 (or 8019555074 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21043312401344 its reverse (44310421334012), we get a palindrome (65353733735356).

The spelling of 21043312401344 in words is "twenty-one trillion, forty-three billion, three hundred twelve million, four hundred one thousand, three hundred forty-four".