21236332602 has 16 divisors (see below), whose sum is σ = 42659772192. Its totient is φ = 7047593040.

The previous prime is 21236332583. The next prime is 21236332603. The reversal of 21236332602 is 20623363212.

It is a self number, because there is not a number n which added to its sum of digits gives 21236332602.

It is not an unprimeable number, because it can be changed into a prime (21236332603) 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 7 ways as a sum of consecutive naturals, for example, 7794649 + ... + 7797372.

It is an arithmetic number, because the mean of its divisors is an integer number (2666235762).

Almost surely, 2^21236332602 is an apocalyptic number.

21236332602 is an abundant number, since it is smaller than the sum of its proper divisors (21423439590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21236332602 is a wasteful number, since it uses less digits than its factorization.

21236332602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15592253.

The product of its (nonzero) digits is 15552, while the sum is 30.

Adding to 21236332602 its reverse (20623363212), we get a palindrome (41859695814).

The spelling of 21236332602 in words is "twenty-one billion, two hundred thirty-six million, three hundred thirty-two thousand, six hundred two".