213231322240 has 32 divisors (see below), whose sum is σ = 509756131260. Its totient is φ = 85292528640.

The previous prime is 213231322123. The next prime is 213231322247. The reversal of 213231322240 is 42223132312.

It can be written as a sum of positive squares in 2 ways, for example, as 212904725056 + 326597184 = 461416^2 + 18072^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (213231322247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166586331 + ... + 166587610.

Almost surely, 2^213231322240 is an apocalyptic number.

213231322240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231322240 is an abundant number, since it is smaller than the sum of its proper divisors (296524809020).

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

213231322240 is an equidigital number, since it uses as much as digits as its factorization.

213231322240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333173960 (or 333173948 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 213231322240 its reverse (42223132312), we get a palindrome (255454454552).

The spelling of 213231322240 in words is "two hundred thirteen billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred forty".