213232144240 has 40 divisors (see below), whose sum is σ = 512860076640. Its totient is φ = 82351723776.

The previous prime is 213232144141. The next prime is 213232144243. The reversal of 213232144240 is 42441232312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 213232144199 and 213232144208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213232144243) 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, 45952884 + ... + 45957523.

It is an arithmetic number, because the mean of its divisors is an integer number (12821501916).

Almost surely, 2^213232144240 is an apocalyptic number.

213232144240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213232144240 is an abundant number, since it is smaller than the sum of its proper divisors (299627932400).

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

213232144240 is a wasteful number, since it uses less digits than its factorization.

213232144240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91910449 (or 91910443 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 213232144240 its reverse (42441232312), we get a palindrome (255673376552).

The spelling of 213232144240 in words is "two hundred thirteen billion, two hundred thirty-two million, one hundred forty-four thousand, two hundred forty".