21230040242 has 8 divisors (see below), whose sum is σ = 32202870300. Its totient is φ = 10495750144.

The previous prime is 21230040239. The next prime is 21230040253. The reversal of 21230040242 is 24204003212.

It can be written as a sum of positive squares in 2 ways, for example, as 20681028481 + 549011761 = 143809^2 + 23431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 59634767 + ... + 59635122.

Almost surely, 2^21230040242 is an apocalyptic number.

21230040242 is a deficient number, since it is larger than the sum of its proper divisors (10972830058).

21230040242 is a wasteful number, since it uses less digits than its factorization.

21230040242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119269980.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21230040242 its reverse (24204003212), we get a palindrome (45434043454).

The spelling of 21230040242 in words is "twenty-one billion, two hundred thirty million, forty thousand, two hundred forty-two".