21615427336 has 16 divisors (see below), whose sum is σ = 40641825600. Its totient is φ = 10777607184.

The previous prime is 21615427333. The next prime is 21615427397. The reversal of 21615427336 is 63372451612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21615427333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3760260 + ... + 3766003.

It is an arithmetic number, because the mean of its divisors is an integer number (2540114100).

Almost surely, 2^21615427336 is an apocalyptic number.

It is an amenable number.

21615427336 is a deficient number, since it is larger than the sum of its proper divisors (19026398264).

21615427336 is a wasteful number, since it uses less digits than its factorization.

21615427336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7526628 (or 7526624 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

Adding to 21615427336 its reverse (63372451612), we get a palindrome (84987878948).

The spelling of 21615427336 in words is "twenty-one billion, six hundred fifteen million, four hundred twenty-seven thousand, three hundred thirty-six".