243121123100 has 36 divisors (see below), whose sum is σ = 527787224664. Its totient is φ = 97208930880.

The previous prime is 243121123073. The next prime is 243121123183. The reversal of 243121123100 is 1321121342.

It is a super-2 number, since 2×243121123100² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246047 + ... + 739446.

Almost surely, 2^243121123100 is an apocalyptic number.

243121123100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121123100 is an abundant number, since it is smaller than the sum of its proper divisors (284666101564).

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

243121123100 is a wasteful number, since it uses less digits than its factorization.

243121123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987974 (or 987967 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 243121123100 its reverse (1321121342), we get a palindrome (244442244442).

The spelling of 243121123100 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred".