21124044443 has 8 divisors (see below), whose sum is σ = 21151949328. Its totient is φ = 21096159264.

The previous prime is 21124044437. The next prime is 21124044449. The reversal of 21124044443 is 34444042112.

It is an interprime number because it is at equal distance from previous prime (21124044437) and next prime (21124044449).

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 21124044443 - 2⁴ = 21124044427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21124044449) 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, 3882521 + ... + 3887957.

It is an arithmetic number, because the mean of its divisors is an integer number (2643993666).

Almost surely, 2^21124044443 is an apocalyptic number.

21124044443 is a deficient number, since it is larger than the sum of its proper divisors (27904885).

21124044443 is a wasteful number, since it uses less digits than its factorization.

21124044443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21124044443 its reverse (34444042112), we get a palindrome (55568086555).

The spelling of 21124044443 in words is "twenty-one billion, one hundred twenty-four million, forty-four thousand, four hundred forty-three".