243121225440 has 96 divisors (see below), whose sum is σ = 765940202496. Its totient is φ = 64823155200.

The previous prime is 243121225439. The next prime is 243121225489. The reversal of 243121225440 is 44522121342.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 243121225398 and 243121225407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3784629 + ... + 3848331.

It is an arithmetic number, because the mean of its divisors is an integer number (7978543776).

Almost surely, 2^243121225440 is an apocalyptic number.

243121225440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121225440 is an abundant number, since it is smaller than the sum of its proper divisors (522818977056).

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

243121225440 is a wasteful number, since it uses less digits than its factorization.

243121225440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71672 (or 71664 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 243121225440 its reverse (44522121342), we get a palindrome (287643346782).

The spelling of 243121225440 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-five thousand, four hundred forty".