21041224443 has 24 divisors (see below), whose sum is σ = 32251547328. Its totient is φ = 13701255624.

The previous prime is 21041224441. The next prime is 21041224447. The reversal of 21041224443 is 34442214012.

21041224443 is a `hidden beast` number, since 2 + 1 + 0 + 412 + 244 + 4 + 3 = 666.

It is not a de Polignac number, because 21041224443 - 2¹ = 21041224441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21041224441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 996405 + ... + 1017302.

It is an arithmetic number, because the mean of its divisors is an integer number (1343814472).

Almost surely, 2^21041224443 is an apocalyptic number.

21041224443 is a deficient number, since it is larger than the sum of its proper divisors (11210322885).

21041224443 is an equidigital number, since it uses as much as digits as its factorization.

21041224443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013765 (or 2013753 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21041224443 its reverse (34442214012), we get a palindrome (55483438455).

The spelling of 21041224443 in words is "twenty-one billion, forty-one million, two hundred twenty-four thousand, four hundred forty-three".