21240233013242 has 16 divisors (see below), whose sum is σ = 32308839993960. Its totient is φ = 10471593603072.

The previous prime is 21240233013203. The next prime is 21240233013253. The reversal of 21240233013242 is 24231033204212.

It can be written as a sum of positive squares in 4 ways, for example, as 7799569858441 + 13440663154801 = 2792771^2 + 3666151^2 .

It is a super-4 number, since 4×21240233013242⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243436517 + ... + 243523752.

Almost surely, 2^{21240233013242} is an apocalyptic number.

21240233013242 is a deficient number, since it is larger than the sum of its proper divisors (11068606980718).

21240233013242 is a wasteful number, since it uses less digits than its factorization.

21240233013242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486960577.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21240233013242 its reverse (24231033204212), we get a palindrome (45471266217454).

The spelling of 21240233013242 in words is "twenty-one trillion, two hundred forty billion, two hundred thirty-three million, thirteen thousand, two hundred forty-two".