21224242241 has 4 divisors (see below), whose sum is σ = 21229678512. Its totient is φ = 21218805972.

The previous prime is 21224242223. The next prime is 21224242307. The reversal of 21224242241 is 14224242212.

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 a cyclic number.

It is not a de Polignac number, because 21224242241 - 2¹⁸ = 21223980097 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 21224242241.

It is not an unprimeable number, because it can be changed into a prime (21224242541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2712275 + ... + 2720088.

It is an arithmetic number, because the mean of its divisors is an integer number (5307419628).

Almost surely, 2^21224242241 is an apocalyptic number.

It is an amenable number.

21224242241 is a deficient number, since it is larger than the sum of its proper divisors (5436271).

21224242241 is an equidigital number, since it uses as much as digits as its factorization.

21224242241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5436270.

The product of its digits is 4096, while the sum is 26.

Adding to 21224242241 its reverse (14224242212), we get a palindrome (35448484453).

The spelling of 21224242241 in words is "twenty-one billion, two hundred twenty-four million, two hundred forty-two thousand, two hundred forty-one".