243121222140 has 24 divisors (see below), whose sum is σ = 680739422160. Its totient is φ = 64832325888.

The previous prime is 243121222129. The next prime is 243121222147. The reversal of 243121222140 is 41222121342.

It is a self number, because there is not a number n which added to its sum of digits gives 243121222140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243121222147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2026010125 + ... + 2026010244.

It is an arithmetic number, because the mean of its divisors is an integer number (28364142590).

Almost surely, 2^243121222140 is an apocalyptic number.

243121222140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121222140 is an abundant number, since it is smaller than the sum of its proper divisors (437618200020).

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

243121222140 is a wasteful number, since it uses less digits than its factorization.

243121222140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052020381 (or 4052020379 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 243121222140 its reverse (41222121342), we get a palindrome (284343343482).

The spelling of 243121222140 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred forty".