243121242100 has 72 divisors (see below), whose sum is σ = 575633032128. Its totient is φ = 88392556800.

The previous prime is 243121242073. The next prime is 243121242157. The reversal of 243121242100 is 1242121342.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7896937 + ... + 7927663.

It is an arithmetic number, because the mean of its divisors is an integer number (7994903224).

Almost surely, 2^243121242100 is an apocalyptic number.

243121242100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121242100 is an abundant number, since it is smaller than the sum of its proper divisors (332511790028).

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

243121242100 is a wasteful number, since it uses less digits than its factorization.

243121242100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37945 (or 37938 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 243121242100 its reverse (1242121342), we get a palindrome (244363363442).

It can be divided in two parts, 243121242 and 100, that added together give a palindrome (243121342).

The spelling of 243121242100 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-two thousand, one hundred".