21213612366730 has 32 divisors (see below), whose sum is σ = 43670624659200. Its totient is φ = 7268039608320.

The previous prime is 21213612366721. The next prime is 21213612366731. The reversal of 21213612366730 is 3766321631212.

It is not an unprimeable number, because it can be changed into a prime (21213612366731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108212151 + ... + 108408010.

It is an arithmetic number, because the mean of its divisors is an integer number (1364707020600).

Almost surely, 2^{21213612366730} is an apocalyptic number.

21213612366730 is an abundant number, since it is smaller than the sum of its proper divisors (22457012292470).

21213612366730 is a wasteful number, since it uses less digits than its factorization.

21213612366730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216621574.

The product of its (nonzero) digits is 326592, while the sum is 43.

Adding to 21213612366730 its reverse (3766321631212), we get a palindrome (24979933997942).

The spelling of 21213612366730 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred sixty-six thousand, seven hundred thirty".