243121350400 has 54 divisors (see below), whose sum is σ = 601763345792. Its totient is φ = 97248537600.

The previous prime is 243121350379. The next prime is 243121350421. The reversal of 243121350400 is 4053121342.

It is an interprime number because it is at equal distance from previous prime (243121350379) and next prime (243121350421).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18987456 + ... + 19000255.

Almost surely, 2^243121350400 is an apocalyptic number.

243121350400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243121350400 is an abundant number, since it is smaller than the sum of its proper divisors (358641995392).

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

243121350400 is an equidigital number, since it uses as much as digits as its factorization.

243121350400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37987737 (or 37987718 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 243121350400 its reverse (4053121342), we get a palindrome (247174471742).

The spelling of 243121350400 in words is "two hundred forty-three billion, one hundred twenty-one million, three hundred fifty thousand, four hundred".