243111220400 has 60 divisors (see below), whose sum is σ = 584318090832. Its totient is φ = 97203966720.

The previous prime is 243111220393. The next prime is 243111220439. The reversal of 243111220400 is 4022111342.

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

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, 843782 + ... + 1094618.

Almost surely, 2^243111220400 is an apocalyptic number.

243111220400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243111220400 is an abundant number, since it is smaller than the sum of its proper divisors (341206870432).

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

243111220400 is a wasteful number, since it uses less digits than its factorization.

243111220400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253278 (or 253267 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 243111220400 its reverse (4022111342), we get a palindrome (247133331742).

The spelling of 243111220400 in words is "two hundred forty-three billion, one hundred eleven million, two hundred twenty thousand, four hundred".