21516300242 has 8 divisors (see below), whose sum is σ = 32308533936. Its totient is φ = 10746788932.

The previous prime is 21516300241. The next prime is 21516300271. The reversal of 21516300242 is 24200361512.

It is a happy number.

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

It is a super-2 number, since 2×21516300242² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21516300241) 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, 5678228 + ... + 5682015.

It is an arithmetic number, because the mean of its divisors is an integer number (4038566742).

Almost surely, 2^21516300242 is an apocalyptic number.

21516300242 is a deficient number, since it is larger than the sum of its proper divisors (10792233694).

21516300242 is a wasteful number, since it uses less digits than its factorization.

21516300242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11361192.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21516300242 its reverse (24200361512), we get a palindrome (45716661754).

The spelling of 21516300242 in words is "twenty-one billion, five hundred sixteen million, three hundred thousand, two hundred forty-two".