21312212242 has 8 divisors (see below), whose sum is σ = 32050500300. Its totient is φ = 10628712144.

The previous prime is 21312212219. The next prime is 21312212261. The reversal of 21312212242 is 24221221312.

It can be written as a sum of positive squares in 2 ways, for example, as 21216544281 + 95667961 = 145659^2 + 9781^2 .

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, 13696017 + ... + 13697572.

Almost surely, 2^21312212242 is an apocalyptic number.

21312212242 is a deficient number, since it is larger than the sum of its proper divisors (10738288058).

21312212242 is a wasteful number, since it uses less digits than its factorization.

21312212242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27393980.

The product of its digits is 768, while the sum is 22.

Adding to 21312212242 its reverse (24221221312), we get a palindrome (45533433554).

The spelling of 21312212242 in words is "twenty-one billion, three hundred twelve million, two hundred twelve thousand, two hundred forty-two".