243121111408 has 40 divisors (see below), whose sum is σ = 543278526560. Its totient is φ = 103238841600.

The previous prime is 243121111391. The next prime is 243121111447. The reversal of 243121111408 is 804111121342.

It is a super-2 number, since 2×243121111408² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9945243 + ... + 9969658.

It is an arithmetic number, because the mean of its divisors is an integer number (13581963164).

Almost surely, 2^243121111408 is an apocalyptic number.

243121111408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

243121111408 is an abundant number, since it is smaller than the sum of its proper divisors (300157415152).

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

243121111408 is a wasteful number, since it uses less digits than its factorization.

243121111408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19915025 (or 19915019 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The spelling of 243121111408 in words is "two hundred forty-three billion, one hundred twenty-one million, one hundred eleven thousand, four hundred eight".