21242433441 has 4 divisors (see below), whose sum is σ = 28323244592. Its totient is φ = 14161622292.

The previous prime is 21242433391. The next prime is 21242433463. The reversal of 21242433441 is 14433424212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21242433441 - 2¹¹ = 21242431393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21242433399 and 21242433408.

It is not an unprimeable number, because it can be changed into a prime (21242433041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3540405571 + ... + 3540405576.

It is an arithmetic number, because the mean of its divisors is an integer number (7080811148).

Almost surely, 2^21242433441 is an apocalyptic number.

It is an amenable number.

21242433441 is a deficient number, since it is larger than the sum of its proper divisors (7080811151).

21242433441 is an equidigital number, since it uses as much as digits as its factorization.

21242433441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7080811150.

The product of its digits is 18432, while the sum is 30.

Adding to 21242433441 its reverse (14433424212), we get a palindrome (35675857653).

The spelling of 21242433441 in words is "twenty-one billion, two hundred forty-two million, four hundred thirty-three thousand, four hundred forty-one".