243121242104 has 32 divisors (see below), whose sum is σ = 491317596000. Its totient is φ = 112118443392.

The previous prime is 243121242073. The next prime is 243121242157. The reversal of 243121242104 is 401242121342.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 823244 + ... + 1078875.

It is an arithmetic number, because the mean of its divisors is an integer number (15353674875).

Almost surely, 2^243121242104 is an apocalyptic number.

It is an amenable number.

243121242104 is an abundant number, since it is smaller than the sum of its proper divisors (248196353896).

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

243121242104 is a wasteful number, since it uses less digits than its factorization.

243121242104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903367 (or 1903363 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 243121242104 its reverse (401242121342), we get a palindrome (644363363446).

The spelling of 243121242104 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-two thousand, one hundred four".