21043213444441 has 8 divisors (see below), whose sum is σ = 21561444584064. Its totient is φ = 20525219544480.

The previous prime is 21043213444381. The next prime is 21043213444457. The reversal of 21043213444441 is 14444431234012.

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

It is a cyclic number.

It is not a de Polignac number, because 21043213444441 - 2⁷ = 21043213444313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21043213444441.

It is not an unprimeable number, because it can be changed into a prime (21043213441441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59130325 + ... + 59485138.

It is an arithmetic number, because the mean of its divisors is an integer number (2695180573008).

Almost surely, 2^{21043213444441} is an apocalyptic number.

It is an amenable number.

21043213444441 is a deficient number, since it is larger than the sum of its proper divisors (518231139623).

21043213444441 is a wasteful number, since it uses less digits than its factorization.

21043213444441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118619831.

The product of its (nonzero) digits is 147456, while the sum is 37.

Adding to 21043213444441 its reverse (14444431234012), we get a palindrome (35487644678453).

The spelling of 21043213444441 in words is "twenty-one trillion, forty-three billion, two hundred thirteen million, four hundred forty-four thousand, four hundred forty-one".