213531221232306 has 24 divisors (see below), whose sum is σ = 462657936683280. Its totient is φ = 71176003383096.

The previous prime is 213531221232181. The next prime is 213531221232311. The reversal of 213531221232306 is 603232122135312.

213531221232306 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 312 + 2 + 1 + 2 + 32 + 306 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87966076 + ... + 90360903.

It is an arithmetic number, because the mean of its divisors is an integer number (19277414028470).

Almost surely, 2^{213531221232306} is an apocalyptic number.

213531221232306 is an abundant number, since it is smaller than the sum of its proper divisors (249126715450974).

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

213531221232306 is a wasteful number, since it uses less digits than its factorization.

213531221232306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178393510 (or 178393507 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 213531221232306 its reverse (603232122135312), we get a palindrome (816763343367618).

The spelling of 213531221232306 in words is "two hundred thirteen trillion, five hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, three hundred six".