243121223532 has 48 divisors (see below), whose sum is σ = 618885171072. Its totient is φ = 73669390080.

The previous prime is 243121223519. The next prime is 243121223539. The reversal of 243121223532 is 235322121342.

It is a self number, because there is not a number n which added to its sum of digits gives 243121223532.

It is not an unprimeable number, because it can be changed into a prime (243121223539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3775348 + ... + 3839204.

It is an arithmetic number, because the mean of its divisors is an integer number (12893441064).

Almost surely, 2^243121223532 is an apocalyptic number.

243121223532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

243121223532 is an abundant number, since it is smaller than the sum of its proper divisors (375763947540).

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

243121223532 is a wasteful number, since it uses less digits than its factorization.

243121223532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92718 (or 92716 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 243121223532 its reverse (235322121342), we get a palindrome (478443344874).

The spelling of 243121223532 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-three thousand, five hundred thirty-two".