243205214520 has 64 divisors (see below), whose sum is σ = 741982032000. Its totient is φ = 63755489408.

The previous prime is 243205214519. The next prime is 243205214533. The reversal of 243205214520 is 25412502342.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17168430 + ... + 17182589.

It is an arithmetic number, because the mean of its divisors is an integer number (11593469250).

Almost surely, 2^243205214520 is an apocalyptic number.

243205214520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243205214520 is an abundant number, since it is smaller than the sum of its proper divisors (498776817480).

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

243205214520 is a wasteful number, since it uses less digits than its factorization.

243205214520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34351092 (or 34351088 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 243205214520 its reverse (25412502342), we get a palindrome (268617716862).

The spelling of 243205214520 in words is "two hundred forty-three billion, two hundred five million, two hundred fourteen thousand, five hundred twenty".