21241442413 has 4 divisors (see below), whose sum is σ = 21241795068. Its totient is φ = 21241089760.

The previous prime is 21241442377. The next prime is 21241442473. The reversal of 21241442413 is 31424414212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10424818404 + 10816624009 = 102102^2 + 104003^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241442413 - 2¹⁷ = 21241311341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241442473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60706 + ... + 214867.

It is an arithmetic number, because the mean of its divisors is an integer number (5310448767).

Almost surely, 2^21241442413 is an apocalyptic number.

It is an amenable number.

21241442413 is a deficient number, since it is larger than the sum of its proper divisors (352655).

21241442413 is an equidigital number, since it uses as much as digits as its factorization.

21241442413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352654.

The product of its digits is 6144, while the sum is 28.

Adding to 21241442413 its reverse (31424414212), we get a palindrome (52665856625).

The spelling of 21241442413 in words is "twenty-one billion, two hundred forty-one million, four hundred forty-two thousand, four hundred thirteen".