21213415166530 has 32 divisors (see below), whose sum is σ = 38757955777200. Its totient is φ = 8358706003200.

The previous prime is 21213415166521. The next prime is 21213415166569. The reversal of 21213415166530 is 3566151431212.

It can be written as a sum of positive squares in 8 ways, for example, as 15207293520409 + 6006121646121 = 3899653^2 + 2450739^2 .

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 15 ways as a sum of consecutive naturals, for example, 53109105 + ... + 53507044.

Almost surely, 2^{21213415166530} is an apocalyptic number.

21213415166530 is a deficient number, since it is larger than the sum of its proper divisors (17544540610670).

21213415166530 is a wasteful number, since it uses less digits than its factorization.

21213415166530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106616454.

The product of its (nonzero) digits is 129600, while the sum is 40.

Adding to 21213415166530 its reverse (3566151431212), we get a palindrome (24779566597742).

The spelling of 21213415166530 in words is "twenty-one trillion, two hundred thirteen billion, four hundred fifteen million, one hundred sixty-six thousand, five hundred thirty".