243121355220 has 24 divisors (see below), whose sum is σ = 680739794784. Its totient is φ = 64832361376.

The previous prime is 243121355189. The next prime is 243121355233. The reversal of 243121355220 is 22553121342.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2026011234 + ... + 2026011353.

It is an arithmetic number, because the mean of its divisors is an integer number (28364158116).

Almost surely, 2^243121355220 is an apocalyptic number.

243121355220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121355220 is an abundant number, since it is smaller than the sum of its proper divisors (437618439564).

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

243121355220 is a wasteful number, since it uses less digits than its factorization.

243121355220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052022599 (or 4052022597 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 243121355220 its reverse (22553121342), we get a palindrome (265674476562).

The spelling of 243121355220 in words is "two hundred forty-three billion, one hundred twenty-one million, three hundred fifty-five thousand, two hundred twenty".